Subject: [bug#47849] [PATCH v3 3/3] services: Add a service for Jami.

From: Maxim Cournoyer <[email-masked]>
Date: Sun, 1 Aug 2021 02:58:57 -0400

* gnu/services/telephony.scm (string-or-computed-file?)
(string-list?, account-fingerprint-list?): New procedures.
(maybe-string-list, maybe-account-fingerprint-list)
(maybe-boolean, maybe-string, jami-account-list): New configuration field
types.
(serialize-string-list, serialize-boolean, serialize-string)
(jami-account, jami-account->alist, jami-configuration)
(jami-account-list?, jami-account-list-maybe): New procedures.
(%jami-accounts): New variable.
(jami-configuration->command-line-arguments): New procedure.
(jami-dbus-session-activation, jami-shepherd-services): New procedures.
(jami-service-type): New variable.
* gnu/build/jami-service.scm: New file.
* gnu/tests/data/jami-dummy-account.dat: Likewise.
* gnu/tests/telephony.scm: Likewise.
* gnu/local.mk (GNU_SYSTEM_MODULES): Register them.
* Makefile.am (SCM_TESTS): Register the test file.
(dist_patch_DATA): Register the new data file.
* doc/guix.texi (Telephony Services): Document it.
---
 Makefile.am                           |   1 +
 doc/guix.texi                         | 264 ++++++++++
 gnu/build/jami-service.scm            | 587 ++++++++++++++++++++++
 gnu/local.mk                          |   5 +-
 gnu/services/telephony.scm            | 684 +++++++++++++++++++++++++-
 gnu/tests/data/jami-dummy-account.dat | 392 +++++++++++++++
 gnu/tests/telephony.scm               | 366 ++++++++++++++
 tests/services/telephony.scm          | 446 +++++++++++++++++
 8 files changed, 2742 insertions(+), 3 deletions(-)
 create mode 100644 gnu/build/jami-service.scm
 create mode 100644 gnu/tests/data/jami-dummy-account.dat
 create mode 100644 gnu/tests/telephony.scm
 create mode 100644 tests/services/telephony.scm

diff --git a/Makefile.am b/Makefile.am
index d5ec909213..5542aa1c56 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -489,6 +489,7 @@ SCM_TESTS =					\
   tests/services/file-sharing.scm		\
   tests/services/configuration.scm		\
   tests/services/linux.scm			\
+  tests/services/telephony.scm			\
   tests/sets.scm				\
   tests/size.scm				\
   tests/status.scm				\
diff --git a/doc/guix.texi b/doc/guix.texi
index 2298d512a1..c931cbeb93 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -22526,6 +22526,270 @@ and Error.
 @node Telephony Services
 @subsection Telephony Services
 
+@cindex telephony, services
+The @code{(gnu services telephony)} module contains Guix service
+definitions for telephony services.  Currently it provides the following
+services:
+
+@subsubheading Jami
+
+@cindex jami, service
+
+This section describes how to configure a Jami server that can be used
+to host video (or audio) conferences, among other uses.  The following
+example demonstrates how to specify Jami account archives (backups) to
+be provisioned automatically:
+
+@lisp
+(service jami-service-type
+         (jami-configuration
+          (accounts
+           (list (jami-account
+                  (archive "/etc/jami/unencrypted-account-1.gz"))
+                 (jami-account
+                  (archive "/etc/jami/unencrypted-account-2.gz"))))))
+@end lisp
+
+When the accounts field is specified, the Jami account files of the
+service found under @file{/var/lib/jami} are recreated every time the
+service starts.
+
+Jami accounts and their corresponding backup archives can be generated
+using either the @code{jami-qt} or @code{jami-gnome} Jami clients.  The
+accounts should not be password-protected, but it is wise to ensure
+their files are only readable by @samp{root}.
+
+The next example shows how to declare that only some contacts should be
+allowed to communicate with a given account:
+
+@lisp
+(service jami-service-type
+         (jami-configuration
+          (accounts
+           (list (jami-account
+                  (archive "/etc/jami/unencrypted-account-1.gz")
+                  (peer-discovery? #t)
+                  (rendezvous-point? #t)
+                  (allowed-contacts
+                   '("1dbcb0f5f37324228235564b79f2b9737e9a008f"
+                     "2dbcb0f5f37324228235564b79f2b9737e9a008f")))))))
+@end lisp
+
+In this mode, only the declared @code{allowed-contacts} can initiate
+communication with the Jami account.  This can be used, for example,
+with rendezvous point accounts to create a private video conferencing
+space.
+
+To put the system administrator in full control of the conferences
+hosted on their system, the Jami service supports the following actions:
+
+@example sh
+herd doc jami list-actions jami
+(list-accounts
+ list-account-details
+ list-banned-contacts
+ list-contacts
+ list-moderators
+ add-moderator
+ ban-contact
+ enable-account
+ disable-account)
+@end example
+
+The above actions aim to provide the most valuable actions for
+moderation purposes, not to cover the whole Jami API.  Users wanting to
+interact with the Jami daemon from Guile may be interested in
+experimenting with the @code{(gnu build jami-service)} module, which
+powers the above Shepherd actions.
+
+@c TODO: This should be auto-generated from the doc already defined on
+@c the shepherd-actions themselves in (gnu services telephony).
+The @code{add-moderator} and @code{ban-contact} actions accept a contact
+@emph{fingerprint} (40 characters long hash) as first argument and an
+account fingerprint or username as second argument:
+
+@example sh
+# herd add-moderator jami 1dbcb0f5f37324228235564b79f2b9737e9a008f \
+  f3345f2775ddfe07a4b0d95daea111d15fbc1199
+
+# herd list-moderators jami
+Moderators for account f3345f2775ddfe07a4b0d95daea111d15fbc1199:
+  - 1dbcb0f5f37324228235564b79f2b9737e9a008f
+
+@end example
+
+In the case of @code{ban-contact}, the second username argument is
+optional; when omitted, the account is banned from all Jami accounts:
+
+@example sh
+# herd ban-contact jami 1dbcb0f5f37324228235564b79f2b9737e9a008f
+
+# herd list-banned-contacts jami
+Banned contacts for account f3345f2775ddfe07a4b0d95daea111d15fbc1199:
+  - 1dbcb0f5f37324228235564b79f2b9737e9a008f
+
+@end example
+
+Banned contacts are also stripped from their moderation privileges.
+
+The @code{disable-account} action allows to completely disconnect an
+account from the network, making it unreachable, while
+@code{enable-account} does the inverse.  They accept a single account
+username or fingerprint as first argument:
+
+@example sh
+# herd disable-account jami f3345f2775ddfe07a4b0d95daea111d15fbc1199
+
+# herd list-accounts jami
+The following Jami accounts are available:
+  - f3345f2775ddfe07a4b0d95daea111d15fbc1199 (dummy) [disabled]
+
+@end example
+
+The @code{list-account-details} action prints the detailed parameters of
+each accounts in the Recutils format, which means the @command{recsel}
+command can be used to select accounts of interest (@pxref{Selection
+Expressions,,,recutils, GNU recutils manual}).  Note that period
+characters (@samp{.}) found in the account parameter keys are mapped to
+underscores (@samp{_}) in the output, to meet the requirements of the
+Recutils format.  The following example shows how to print the account
+fingerprints for all accounts operating in the rendezvous point mode:
+
+@example sh
+# herd list-account-details jami | \
+  recsel -p Account.username -e 'Account.rendezVous ~ "true"'
+Account_username: f3345f2775ddfe07a4b0d95daea111d15fbc1199
+@end example
+
+The remaining actions should be self-explanatory.
+
+The complete set of available configuration options is detailed below.
+
+@c TODO: Ideally, the following fragments would be auto-generated at
+@c build time, so that they needn't be manually duplicated.
+@c Auto-generated via (configuration->documentation 'jami-configuration)
+Available @code{jami-configuration} fields are:
+
+@deftypevr {@code{jami-configuration} parameter} package jamid
+The Jami daemon package to use.
+
+@end deftypevr
+
+@deftypevr {@code{jami-configuration} parameter} package dbus
+The D-Bus package to use to start the required D-Bus session.
+
+@end deftypevr
+
+@deftypevr {@code{jami-configuration} parameter} package nss-certs
+The nss-certs package to use to provide TLS certificates.
+
+@end deftypevr
+
+@deftypevr {@code{jami-configuration} parameter} boolean enable-logging?
+Whether to enable logging to syslog.
+
+Defaults to @samp{#t}.
+
+@end deftypevr
+
+@deftypevr {@code{jami-configuration} parameter} boolean debug?
+Whether to enable debug level messages.
+
+Defaults to @samp{#f}.
+
+@end deftypevr
+
+@deftypevr {@code{jami-configuration} parameter} boolean auto-answer?
+Whether to force automatic answer to incoming calls.
+
+Defaults to @samp{#f}.
+
+@end deftypevr
+
+@deftypevr {@code{jami-configuration} parameter} maybe-jami-account-list accounts
+A list of Jami accounts to be (re-)provisioned every time the Jami
+daemon service starts.  When providing this field, the account
+directories under @file{/var/lib/jami/} are recreated every time the
+service starts, ensuring a consistent state.
+
+Defaults to @samp{disabled}.
+
+@end deftypevr
+
+@c Auto-generated via (configuration->documentation 'jami-account)
+Available @code{jami-account} fields are:
+
+@deftypevr {@code{jami-account} parameter} string-or-computed-file archive
+The account archive (backup) file name of the account.  This is used to
+provision the account when the service starts.  The account archive
+should @emph{not} be encrypted.  It is highly recommended to make it
+readable only to the @samp{root} user (i.e., not in the store), to guard
+against leaking the secret key material of the Jami account it contains.
+
+@end deftypevr
+
+@deftypevr {@code{jami-account} parameter} maybe-account-fingerprint-list allowed-contacts
+The list of allowed contacts for the account, entered as their 40
+characters long fingerprint.  Messages or calls from accounts not in
+that list will be rejected.  When unspecified, the configuration of the
+account archive is used as-is with respect to contacts and public
+inbound calls/messaging allowance, which typically defaults to allow any
+contact to communicate with the account.
+
+Defaults to @samp{disabled}.
+
+@end deftypevr
+
+@deftypevr {@code{jami-account} parameter} maybe-account-fingerprint-list moderators
+The list of contacts that should have moderation privileges (to ban,
+mute, etc.  other users) in rendezvous conferences, entered as their 40
+characters long fingerprint.  When unspecified, the configuration of the
+account archive is used as-is with respect to moderation, which
+typically defaults to allow anyone to moderate.
+
+Defaults to @samp{disabled}.
+
+@end deftypevr
+
+@deftypevr {@code{jami-account} parameter} maybe-boolean rendezvous-point?
+Whether the account should operate in the rendezvous mode.  In this
+mode, all the incoming audio/video calls are mixed into a conference.
+When left unspecified, the value from the account archive prevails.
+
+Defaults to @samp{disabled}.
+
+@end deftypevr
+
+@deftypevr {@code{jami-account} parameter} maybe-boolean peer-discovery?
+Whether peer discovery should be enabled.  Peer discovery is used to
+discover other OpenDHT nodes on the local network, which can be useful
+to maintain communication between devices on such network even when the
+connection to the the Internet has been lost.  When left unspecified,
+the value from the account archive prevails.
+
+Defaults to @samp{disabled}.
+
+@end deftypevr
+
+@deftypevr {@code{jami-account} parameter} maybe-string-list bootstrap-hostnames
+A list of hostnames or IPs pointing to OpenDHT nodes, that should be
+used to initially join the OpenDHT network.  When left unspecified, the
+value from the account archive prevails.
+
+Defaults to @samp{disabled}.
+
+@end deftypevr
+
+@deftypevr {@code{jami-account} parameter} maybe-string name-server-uri
+The URI of the name server to use, that can be used to retrieve the
+account fingerprint for a registered username.
+
+Defaults to @samp{disabled}.
+
+@end deftypevr
+
+@subsubheading Murmur (VoIP server)
+
 @cindex Murmur (VoIP server)
 @cindex VoIP server
 This section describes how to set up and run a Murmur server.  Murmur is
diff --git a/gnu/build/jami-service.scm b/gnu/build/jami-service.scm
new file mode 100644
index 0000000000..bb43b578f9
--- /dev/null
+++ b/gnu/build/jami-service.scm
@@ -0,0 +1,587 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2021 Maxim Cournoyer <[email-masked]>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;;
+;;; This module contains helpers used as part of the jami-service-type
+;;; definition.
+;;;
+;;; Code:
+
+(define-module (gnu build jami-service)
+  #:use-module (ice-9 format)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 peg)
+  #:use-module (ice-9 rdelim)
+  #:use-module (ice-9 regex)
+  #:use-module (rnrs io ports)
+  #:autoload (shepherd service) (fork+exec-command)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
+  #:export (account-fingerprint?
+            account-details->recutil
+            get-accounts
+            get-usernames
+            set-account-details
+            add-account
+            account->username
+            username->account
+            username->contacts
+            enable-account
+            disable-account
+
+            add-contact
+            remove-contact
+
+            set-all-moderators
+            set-moderator
+            username->all-moderators?
+            username->moderators
+
+            dbus-available-services
+            dbus-service-available?
+
+            %send-dbus-binary
+            %send-dbus-bus
+            %send-dbus-user
+            %send-dbus-group
+            %send-dbus-debug
+            send-dbus
+
+            with-retries))
+
+;;;
+;;; Utilities.
+;;;
+
+(define-syntax-rule (with-retries n delay body ...)
+  "Retry the code in BODY up to N times until it doesn't raise an exception
+nor return #f, else raise an error.  A delay of DELAY seconds is inserted
+before each retry."
+  (let loop ((attempts 0))
+    (catch #t
+      (lambda ()
+        (let ((result (begin body ...)))
+          (if (not result)
+              (error "failed attempt" attempts)
+              result)))
+      (lambda args
+        (if (< attempts n)
+            (begin
+              (sleep delay)             ;else wait and retry
+              (loop (+ 1 attempts)))
+            (error "maximum number of retry attempts reached"
+                   body ... args))))))
+
+(define (alist->list alist)
+  "Flatten ALIST into a list."
+  (append-map (match-lambda
+                (() '())
+                ((key . value)
+                 (list key value)))
+              alist))
+
+(define account-fingerprint-rx (make-regexp "[0-9A-f]{40}"))
+
+(define (account-fingerprint? val)
+  "A Jami account fingerprint is 40 characters long and only contains
+hexadecimal characters."
+  (and (string? val)
+       (regexp-exec account-fingerprint-rx val)))
+
+
+;;;
+;;; D-Bus reply parser.
+;;;
+
+(define (parse-dbus-reply reply)
+  "Return the parse tree of REPLY, a string returned by the 'dbus-send'
+command."
+  ;; Refer to 'man 1 dbus-send' for the grammar reference.  Note that the
+  ;; format of the replies doesn't match the format of the input, which is the
+  ;; one documented, but it gives an idea.  For an even better reference, see
+  ;; the `print_iter' procedure of the 'dbus-print-message.c' file from the
+  ;; 'dbus' package sources.
+  (define-peg-string-patterns
+    "contents <- header (item / container (item / container*)?)
+     item <-- WS type WS value NL
+     container <- array / dict / variant
+     array <-- array-start (item / container)* array-end
+     dict <-- array-start dict-entry* array-end
+     dict-entry <-- dict-entry-start item item dict-entry-end
+     variant <-- variant-start item
+     type <-- 'string' / 'int16' / 'uint16' / 'int32' / 'uint32' / 'int64' /
+              'uint64' / 'double' / 'byte' / 'boolean' / 'objpath'
+     value <-- (!NL .)* NL
+     header < (!NL .)* NL
+     variant-start < WS 'variant'
+     array-start < WS 'array [' NL
+     array-end < WS ']' NL
+     dict-entry-start < WS 'dict entry(' NL
+     dict-entry-end < WS ')' NL
+     DQ < '\"'
+     WS < ' '*
+     NL < '\n'*")
+
+  (peg:tree (match-pattern contents reply)))
+
+(define (strip-quotes text)
+  "Strip the leading and trailing double quotes (\") characters from TEXT."
+  (let* ((text* (if (string-prefix? "\"" text)
+                    (string-drop text 1)
+                    text))
+         (text** (if (string-suffix? "\"" text*)
+                     (string-drop-right text* 1)
+                     text*)))
+    text**))
+
+(define (deserialize-item item)
+  "Return the value described by the ITEM parse tree as a Guile object."
+  ;; Strings are printed wrapped in double quotes (see the print_iter
+  ;; procedure in dbus-print-message.c).
+  (match item
+    (('item ('type "string") ('value value))
+     (strip-quotes value))
+    (('item ('type "boolean") ('value value))
+     (if (string=? "true" value)
+         #t
+         #f))
+    (('item _ ('value value))
+     value)))
+
+(define (serialize-boolean bool)
+  "Return the serialized format expected by dbus-send for BOOL."
+  (format #f "boolean:~:[false~;true~]" bool))
+
+(define (dict->alist dict-parse-tree)
+  "Translate a dict parse tree to an alist."
+  (define (tuples->alist tuples)
+    (map (lambda (x) (apply cons x)) tuples))
+
+  (match dict-parse-tree
+    ('dict
+     '())
+    (('dict ('dict-entry keys values) ...)
+     (let ((keys* (map deserialize-item keys))
+           (values* (map deserialize-item values)))
+       (tuples->alist (zip keys* values*))))))
+
+(define (array->list array-parse-tree)
+  "Translate an array parse tree to a list."
+  (match array-parse-tree
+    ('array
+     '())
+    (('array items ...)
+     (map deserialize-item items))))
+
+
+;;;
+;;; Low-level, D-Bus-related procedures.
+;;;
+
+;;; The following parameters are used in the jami-service-type service
+;;; definition to conveniently customize the behavior of the send-dbus helper,
+;;; even when called indirectly.
+(define %send-dbus-binary (make-parameter "dbus-send"))
+(define %send-dbus-bus (make-parameter #f))
+(define %send-dbus-user (make-parameter #f))
+(define %send-dbus-group (make-parameter #f))
+(define %send-dbus-debug (make-parameter #f))
+
+(define* (send-dbus #:key service path interface method
+                    bus
+                    dbus-send
+                    user group
+                    timeout
+                    arguments)
+  "Return the response of DBUS-SEND, else raise an error.  Unless explicitly
+provided, DBUS-SEND takes the value of the %SEND-DBUS-BINARY parameter.  BUS
+can be used to specify the bus address, such as 'unix:path=/var/run/jami/bus'.
+Alternatively, the %SEND-DBUS-BUS parameter can be used.  ARGUMENTS can be
+used to pass input values to a D-Bus method call.  TIMEOUT is the amount of
+time to wait for a reply in milliseconds before giving up with an error.  USER
+and GROUP allow choosing under which user/group the DBUS-SEND command is
+executed.  Alternatively, the %SEND-DBUS-USER and %SEND-DBUS-GROUP parameters
+can be used instead."
+  (let* ((command `(,@(if dbus-send
+                          (list dbus-send)
+                          (list (%send-dbus-binary)))
+                    ,@(if (or bus (%send-dbus-bus))
+                          (list (string-append "--bus="
+                                               (or bus (%send-dbus-bus))))
+                          '())
+                    "--print-reply"
+                    ,@(if timeout
+                          (list (format #f "--reply-timeout=~d" timeout))
+                          '())
+                    ,(string-append "--dest=" service) ;e.g., cx.ring.Ring
+                    ,path            ;e.g., /cx/ring/Ring/ConfigurationManager
+                    ,(string-append interface "." method)
+                    ,@(or arguments '())))
+         (temp-port (mkstemp! (string-copy "/tmp/dbus-send-output-XXXXXXX")))
+         (temp-file (port-filename temp-port)))
+    (dynamic-wind
+      (lambda ()
+        (let* ((uid (or (and=> (or user (%send-dbus-user))
+                               (compose passwd:uid getpwnam)) -1))
+               (gid (or (and=> (or group (%send-dbus-group))
+                               (compose group:gid getgrnam)) -1)))
+          (chown temp-port uid gid)))
+      (lambda ()
+        (let ((pid (fork+exec-command command
+                                      #:user (or user (%send-dbus-user))
+                                      #:group (or group (%send-dbus-group))
+                                      #:log-file temp-file)))
+          (match (waitpid pid)
+            ((_ . status)
+             (let ((exit-status (status:exit-val status))
+                   (output (call-with-port temp-port get-string-all)))
+               (if (= 0 exit-status)
+                   output
+                   (error "the send-dbus command exited with: "
+                          command exit-status output)))))))
+      (lambda ()
+        (false-if-exception (delete-file temp-file))))))
+
+(define (parse-account-ids reply)
+  "Return the Jami account IDs from REPLY, which is assumed to be the output
+of the Jami D-Bus `getAccountList' method."
+  (array->list (parse-dbus-reply reply)))
+
+(define (parse-account-details reply)
+  "Parse REPLY, which is assumed to be the output of the Jami D-Bus
+`getAccountDetails' method, and return its content as an alist."
+  (dict->alist (parse-dbus-reply reply)))
+
+(define (parse-contacts reply)
+  "Parse REPLY, which is assumed to be the output of the Jamid D-Bus
+`getContacts' method, and return its content as an alist."
+  (match (parse-dbus-reply reply)
+    ('array
+     '())
+    (('array dicts ...)
+     (map dict->alist dicts))))
+
+
+;;;
+;;; Higher-level, D-Bus-related procedures.
+;;;
+
+(define (validate-fingerprint fingerprint)
+  "Validate that fingerprint is 40 characters long."
+  (unless (account-fingerprint? fingerprint)
+    (error "Account fingerprint is not valid:" fingerprint)))
+
+(define (dbus-available-services)
+  "Return the list of available (acquired) D-Bus services."
+  (let ((reply (parse-dbus-reply
+                (send-dbus #:service "org.freedesktop.DBus"
+                           #:path "/org/freedesktop/DBus"
+                           #:interface "org.freedesktop.DBus"
+                           #:method "ListNames"))))
+    ;; Remove entries such as ":1.7".
+    (remove (cut string-prefix? ":" <>)
+            (array->list reply))))
+
+(define (dbus-service-available? service)
+  "Predicate to check for the D-Bus SERVICE availability."
+  (member service (dbus-available-services)))
+
+(define* (send-dbus/configuration-manager #:key method arguments timeout)
+  "Query the Jami D-Bus ConfigurationManager service."
+  (send-dbus #:service "cx.ring.Ring"
+             #:path "/cx/ring/Ring/ConfigurationManager"
+             #:interface "cx.ring.Ring.ConfigurationManager"
+             #:method method
+             #:arguments arguments
+             #:timeout timeout))
+
+;;; The following methods are for internal use; they make use of the account
+;;; ID, an implementation detail of Jami the user should not need to be
+;;; concerned with.
+(define (get-account-ids)
+  "Return the available Jami account identifiers (IDs).  Account IDs are an
+implementation detail used to identify the accounts in Jami."
+  (parse-account-ids
+   (send-dbus/configuration-manager #:method "getAccountList")))
+
+(define (id->account-details id)
+  "Retrieve the account data associated with the given account ID."
+  (parse-account-details
+   (send-dbus/configuration-manager
+    #:method "getAccountDetails"
+    #:arguments (list (string-append "string:" id)))))
+
+(define (id->volatile-account-details id)
+  "Retrieve the account data associated with the given account ID."
+  (parse-account-details
+   (send-dbus/configuration-manager
+    #:method "getVolatileAccountDetails"
+    #:arguments (list (string-append "string:" id)))))
+
+(define (id->account id)
+  "Retrieve the complete account data associated with the given account ID."
+  (append (id->volatile-account-details id)
+          (id->account-details id)))
+
+(define %username-to-id-cache #f)
+
+(define (invalidate-username-to-id-cache!)
+  (set! %username-to-id-cache #f))
+
+(define (username->id username)
+  "Return the first account ID corresponding to USERNAME."
+  (unless (assoc-ref %username-to-id-cache username)
+    (set! %username-to-id-cache
+          (append-map
+           (lambda (id)
+             (let* ((account (id->account id))
+                    (username (assoc-ref account "Account.username"))
+                    (registered-name (assoc-ref account
+                                                "Account.registeredName")))
+               `(,@(if username
+                       (list (cons username id))
+                       '())
+                 ,@(if registered-name
+                       (list (cons registered-name id))
+                       '()))))
+           (get-account-ids))))
+  (or (assoc-ref %username-to-id-cache username)
+      (let ((message (format #f "Could not retrieve a local account ID\
+ for ~:[username~;fingerprint~]" (account-fingerprint? username))))
+        (error message username))))
+
+(define (account->username account)
+  "Return USERNAME, the registered username associated with ACCOUNT, else its
+public key fingerprint."
+  (or (assoc-ref account "Account.registeredName")
+      (assoc-ref account "Account.username")))
+
+(define (id->username id)
+  "Return USERNAME, the registered username associated with ID, else its
+public key fingerprint, else #f."
+  (account->username (id->account id)))
+
+(define (get-accounts)
+  "Return the list of all accounts, as a list of alists."
+  (map id->account (get-account-ids)))
+
+(define (get-usernames)
+  "Return the list of the usernames associated with the present accounts."
+  (map account->username (get-accounts)))
+
+(define (username->account username)
+  "Return the first account associated with USERNAME, else #f.
+USERNAME can be either the account 40 characters public key fingerprint or a
+registered username."
+  (find (lambda (account)
+          (member username
+                  (list (assoc-ref account "Account.username")
+                        (assoc-ref account "Account.registeredName"))))
+        (get-accounts)))
+
+(define (add-account archive)
+  "Import the Jami account ARCHIVE and return its account ID.  The archive
+should *not* be encrypted with a password.  Return the username associated
+with the account."
+  (invalidate-username-to-id-cache!)
+  (let ((reply (send-dbus/configuration-manager
+                #:method "addAccount"
+                #:arguments (list (string-append
+                                   "dict:string:string:Account.archivePath,"
+                                   archive
+                                   ",Account.type,RING")))))
+    ;; The account information takes some time to be populated.
+    (let ((id (deserialize-item (parse-dbus-reply reply))))
+      (with-retries 20 1
+        (let ((username (id->username id)))
+          (if (string-null? username)
+              #f
+              username))))))
+
+(define (remove-account username)
+  "Delete the Jami account associated with USERNAME, the account 40 characters
+fingerprint or a registered username."
+  (let ((id (username->id username)))
+    (send-dbus/configuration-manager
+     #:method "removeAccount"
+     #:arguments (list (string-append "string:" id))))
+  (invalidate-username-to-id-cache!))
+
+(define* (username->contacts username)
+  "Return the contacts associated with the account of USERNAME as two values;
+the first one being the regular contacts and the second one the banned
+contacts.  USERNAME can be either the account 40 characters public key
+fingerprint or a registered username.  The contacts returned are represented
+using their 40 characters fingerprint."
+  (let* ((id (username->id username))
+         (reply (send-dbus/configuration-manager
+                 #:method "getContacts"
+                 #:arguments (list (string-append "string:" id))))
+         (all-contacts (parse-contacts reply))
+         (banned? (lambda (contact)
+                    (and=> (assoc-ref contact "banned")
+                           (cut string=? "true" <>))))
+         (banned (filter banned? all-contacts))
+         (not-banned (filter (negate banned?) all-contacts))
+         (fingerprint (cut assoc-ref <> "id")))
+    (values (map fingerprint not-banned)
+            (map fingerprint banned))))
+
+(define* (remove-contact contact username #:key ban?)
+  "Remove CONTACT, the 40 characters public key fingerprint of a contact, from
+the account associated with USERNAME (either a fingerprint or a registered
+username).  When BAN? is true, also mark the contact as banned."
+  (validate-fingerprint contact)
+  (let ((id (username->id username)))
+    (send-dbus/configuration-manager
+     #:method "removeContact"
+     #:arguments (list (string-append "string:" id)
+                       (string-append "string:" contact)
+                       (serialize-boolean ban?)))))
+
+(define (add-contact contact username)
+  "Add CONTACT, the 40 characters public key fingerprint of a contact, to the
+account of USERNAME (either a fingerprint or a registered username)."
+  (validate-fingerprint contact)
+  (let ((id (username->id username)))
+    (send-dbus/configuration-manager
+     #:method "addContact"
+     #:arguments (list (string-append "string:" id)
+                       (string-append "string:" contact)))))
+
+(define* (set-account-details details username #:key timeout)
+  "Set DETAILS, an alist containing the key value pairs to set for the account
+of USERNAME, a registered username or account fingerprint.  The value of the
+parameters not provided are unchanged.  TIMEOUT is a value in milliseconds to
+pass to the `send-dbus/configuration-manager' procedure."
+  (let* ((id (username->id username))
+         (current-details (id->account-details id))
+         (updated-details (map (match-lambda
+                                 ((key . value)
+                                  (or (and=> (assoc-ref details key)
+                                             (cut cons key <>))
+                                      (cons key value))))
+                               current-details))
+         ;; dbus-send does not permit sending null strings (it throws a
+         ;; "malformed dictionary" error).  Luckily they seem to have the
+         ;; semantic of "default account value" in Jami; so simply drop them.
+         (updated-details* (remove (match-lambda
+                                     ((_ . value)
+                                      (string-null? value)))
+                                   updated-details)))
+    (send-dbus/configuration-manager
+     #:timeout timeout
+     #:method "setAccountDetails"
+     #:arguments
+     (list (string-append "string:" id)
+           (string-append "dict:string:string:"
+                          (string-join (alist->list updated-details*)
+                                       ","))))))
+
+(define (set-all-moderators enabled? username)
+  "Set the 'AllModerators' property to enabled? for the account of USERNAME, a
+registered username or account fingerprint."
+  (let ((id (username->id username)))
+    (send-dbus/configuration-manager
+     #:method "setAllModerators"
+     #:arguments
+     (list (string-append "string:" id)
+           (serialize-boolean enabled?)))))
+
+(define (username->all-moderators? username)
+  "Return the 'AllModerators' property for the account of USERNAME, a
+registered username or account fingerprint."
+  (let* ((id (username->id username))
+         (reply (send-dbus/configuration-manager
+                 #:method "isAllModerators"
+                 #:arguments
+                 (list (string-append "string:" id)))))
+    (deserialize-item (parse-dbus-reply reply))))
+
+(define (username->moderators username)
+  "Return the moderators for the account of USERNAME, a registered username or
+account fingerprint."
+  (let* ((id (username->id username))
+         (reply (send-dbus/configuration-manager
+                 #:method "getDefaultModerators"
+                 #:arguments
+                 (list (string-append "string:" id)))))
+    (array->list (parse-dbus-reply reply))))
+
+(define (set-moderator contact enabled? username)
+  "Set the moderator flag to ENABLED? for CONTACT, the 40 characters public
+key fingerprint of a contact for the account of USERNAME, a registered
+username or account fingerprint."
+  (validate-fingerprint contact)
+  (let* ((id (username->id username)))
+    (send-dbus/configuration-manager #:method "setDefaultModerator"
+                                     #:arguments
+                                     (list (string-append "string:" id)
+                                           (string-append "string:" contact)
+                                           (serialize-boolean enabled?)))))
+
+(define (disable-account username)
+  "Disable the account known by USERNAME, a registered username or account
+fingerprint."
+  (set-account-details '(("Account.enable" . "false")) username
+                       ;; Waiting for the reply on this command takes a very
+                       ;; long time that trips the default D-Bus timeout value
+                       ;; (25 s), for some reason.
+                        #:timeout 60000))
+
+(define (enable-account username)
+  "Enable the account known by USERNAME, a registered username or account
+fingerprint."
+  (set-account-details '(("Account.enable" . "true")) username))
+
+
+;;;
+;;; Presentation procedures.
+;;;
+
+(define (.->_ text)
+  "Map each period character to underscore characters."
+  (string-map (match-lambda
+                (#\. #\_)
+                (c c))
+              text))
+
+(define (account-details->recutil account-details)
+  "Serialize the account-details alist into a recutil string.  Period
+characters in the keys are normalized to underscore to meet Recutils' format
+requirements."
+  (define (pair->recutil-property pair)
+    (match pair
+      ((key . value)
+       (string-append (.->_ key) ": " value))))
+
+  (define sorted-account-details
+    ;; Have the account username, display name and alias appear first, for
+    ;; convenience.
+    (let ((first-items '("Account.username"
+                         "Account.displayName"
+                         "Account.alias")))
+      (append (map (cut assoc <> account-details) first-items)
+              (fold alist-delete account-details first-items))))
+
+  (string-join (map pair->recutil-property sorted-account-details) "\n"))
+
+;; Local Variables:
+;; eval: (put 'with-retries 'scheme-indent-function 2)
+;; End:
diff --git a/gnu/local.mk b/gnu/local.mk
index c530507b1a..0f094e580b 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -685,6 +685,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/build/chromium-extension.scm		\
   %D%/build/cross-toolchain.scm			\
   %D%/build/image.scm				\
+  %D%/build/jami-service.scm			\
   %D%/build/file-systems.scm			\
   %D%/build/hurd-boot.scm			\
   %D%/build/install.scm				\
@@ -722,6 +723,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/tests/security-token.scm			\
   %D%/tests/singularity.scm			\
   %D%/tests/ssh.scm				\
+  %D%/tests/telephony.scm		        \
   %D%/tests/version-control.scm			\
   %D%/tests/virtualization.scm			\
   %D%/tests/web.scm
@@ -1879,7 +1881,8 @@ dist_patch_DATA =						\
   %D%/packages/patches/ytnef-CVE-2021-3403.patch	\
   %D%/packages/patches/ytnef-CVE-2021-3404.patch	\
   %D%/packages/patches/zstd-CVE-2021-24031_CVE-2021-24032.patch	\
-  %D%/packages/patches/zziplib-CVE-2018-16548.patch
+  %D%/packages/patches/zziplib-CVE-2018-16548.patch		\
+  %D%/tests/data/jami-dummy-account.dat
 
 MISC_DISTRO_FILES =				\
   %D%/packages/ld-wrapper.in
diff --git a/gnu/services/telephony.scm b/gnu/services/telephony.scm
index e1259cc2df..fd90840324 100644
--- a/gnu/services/telephony.scm
+++ b/gnu/services/telephony.scm
@@ -1,5 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2017 nee  <[email-masked]>
+;;; Copyright © 2021 Maxim Cournoyer <[email-masked]>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -17,16 +18,45 @@
 ;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
 
 (define-module (gnu services telephony)
-  #:use-module (gnu services)
+  #:use-module ((gnu build jami-service) #:select (account-fingerprint?))
+  #:use-module ((gnu services) #:hide (delete))
+  #:use-module (gnu services configuration)
   #:use-module (gnu services shepherd)
   #:use-module (gnu system shadow)
   #:use-module (gnu packages admin)
+  #:use-module (gnu packages certs)
+  #:use-module (gnu packages glib)
+  #:use-module (gnu packages jami)
   #:use-module (gnu packages telephony)
   #:use-module (guix records)
+  #:use-module (guix modules)
+  #:use-module (guix packages)
   #:use-module (guix gexp)
   #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-2)
+  #:use-module (srfi srfi-26)
+  #:use-module (ice-9 format)
   #:use-module (ice-9 match)
-  #:export (murmur-configuration
+  #:export (jami-account
+            jami-account-archive
+            jami-account-allowed-contacts
+            jami-account-moderators
+            jami-account-rendezvous-point?
+            jami-account-discovery?
+            jami-account-bootstrap-uri
+            jami-account-name-server-uri
+
+            jami-configuration
+            jami-configuration-jamid
+            jami-configuration-dbus
+            jami-configuration-enable-logging?
+            jami-configuration-debug?
+            jami-configuration-auto-answer?
+            jami-configuration-accounts
+
+            jami-service-type
+
+            murmur-configuration
             make-murmur-configuration
             murmur-configuration?
             murmur-configuration-package
@@ -74,6 +104,652 @@
 
             murmur-service-type))
 
+
+;;;
+;;; Jami daemon.
+;;;
+
+;;; XXX: Passing a computed-file object as the account is used for tests.
+(define (string-or-computed-file? val)
+  (or (string? val)
+      (computed-file? val)))
+
+(define (string-list? val)
+  (and (list? val)
+       (and-map string? val)))
+
+(define (account-fingerprint-list? val)
+  (and (list? val)
+       (and-map account-fingerprint? val)))
+
+(define-maybe string-list)
+
+(define-maybe/no-serialization account-fingerprint-list)
+
+(define-maybe boolean)
+
+(define-maybe string)
+
+;;; The following serializers are used to derive an account details alist from
+;;; a <jami-account> record.
+(define (serialize-string-list _ val)
+  (string-join val ";"))
+
+(define (serialize-boolean _ val)
+  (format #f "~:[false~;true~]" val))
+
+(define (serialize-string _ val)
+  val)
+
+;;; Note: Serialization is used to produce an account details alist that can
+;;; be passed to the SET-ACCOUNT-DETAILS procedure.  Fields that do not map to
+;;; a Jami account 'detail' should have their serialization disabled via the
+;;; 'empty-serializer' procedure.
+(define-configuration jami-account
+  (archive
+   (string-or-computed-file)
+   "The account archive (backup) file name of the account.  This is used to
+provision the account when the service starts.  The account archive should
+@emph{not} be encrypted.  It is highly recommended to make it readable only to
+the @samp{root} user (i.e., not in the store), to guard against leaking the
+secret key material of the Jami account it contains."
+   empty-serializer)
+  (allowed-contacts
+   (maybe-account-fingerprint-list 'disabled)
+   "The list of allowed contacts for the account, entered as their 40
+characters long fingerprint.  Messages or calls from accounts not in that list
+will be rejected.  When unspecified, the configuration of the account archive
+is used as-is with respect to contacts and public inbound calls/messaging
+allowance, which typically defaults to allow any contact to communicate with
+the account."
+   empty-serializer)
+  (moderators
+   (maybe-account-fingerprint-list 'disabled)
+   "The list of contacts that should have moderation privileges (to ban, mute,
+etc. other users) in rendezvous conferences, entered as their 40 characters
+long fingerprint.  When unspecified, the configuration of the account archive
+is used as-is with respect to moderation, which typically defaults to allow
+anyone to moderate."
+   empty-serializer)
+  ;; The serializable fields below are to be set with set-account-details.
+  (rendezvous-point?
+   (maybe-boolean 'disabled)
+   "Whether the account should operate in the rendezvous mode.  In this mode,
+all the incoming audio/video calls are mixed into a conference.  When left
+unspecified, the value from the account archive prevails.")
+  (peer-discovery?
+   (maybe-boolean 'disabled)
+   "Whether peer discovery should be enabled.  Peer discovery is used to
+discover other OpenDHT nodes on the local network, which can be useful to
+maintain communication between devices on such network even when the
+connection to the the Internet has been lost.  When left unspecified, the
+value from the account archive prevails.")
+  (bootstrap-hostnames
+   (maybe-string-list 'disabled)
+   "A list of hostnames or IPs pointing to OpenDHT nodes, that should be used
+to initially join the OpenDHT network.  When left unspecified, the value from
+the account archive prevails.")
+  (name-server-uri
+   (maybe-string 'disabled)
+   "The URI of the name server to use, that can be used to retrieve the
+account fingerprint for a registered username."))
+
+(define (jami-account->alist jami-account-object)
+  "Serialize the JAMI-ACCOUNT object as an alist suitable to be passed to
+SET-ACCOUNT-DETAILS."
+  (define (field-name->account-detail name)
+    (match name
+      ('rendezvous-point? "Account.rendezVous")
+      ('peer-discovery? "Account.peerDiscovery")
+      ('bootstrap-hostnames "Account.hostname")
+      ('name-server-uri "RingNS.uri")
+      (_ #f)))
+
+  (filter-map (lambda (field)
+                (and-let* ((name (field-name->account-detail
+                                  (configuration-field-name field)))
+                           (value ((configuration-field-serializer field)
+                                   name ((configuration-field-getter field)
+                                         jami-account-object)))
+                           ;; The define-maybe default serializer produces an
+                           ;; empty string for the 'disabled value.
+                           (value* (if (string-null? value)
+                                       #f
+                                       value)))
+                  (cons name value*)))
+              jami-account-fields))
+
+(define (jami-account-list? val)
+  (and (list? val)
+       (and-map jami-account? val)))
+
+(define-maybe/no-serialization jami-account-list)
+
+(define-configuration/no-serialization jami-configuration
+  (jamid
+   (package libring)
+   "The Jami daemon package to use.")
+  (dbus
+   (package dbus)
+   "The D-Bus package to use to start the required D-Bus session.")
+  (nss-certs
+   (package nss-certs)
+   "The nss-certs package to use to provide TLS certificates.")
+  (enable-logging?
+   (boolean #t)
+   "Whether to enable logging to syslog.")
+  (debug?
+   (boolean #f)
+   "Whether to enable debug level messages.")
+  (auto-answer?
+   (boolean #f)
+   "Whether to force automatic answer to incoming calls.")
+  (accounts
+   (maybe-jami-account-list 'disabled)
+   "A list of Jami accounts to be (re-)provisioned every time the Jami daemon
+service starts.  When providing this field, the account directories under
+@file{/var/lib/jami/} are recreated every time the service starts, ensuring a
+consistent state."))
+
+(define %jami-accounts
+  (list (user-group (name "jami") (system? #t))
+        (user-account
+         (name "jami")
+         (group "jami")
+         (system? #t)
+         (comment "Jami daemon user")
+         (home-directory "/var/lib/jami"))))
+
+(define (jami-configuration->command-line-arguments config)
+  "Derive the command line arguments to used to launch the Jami daemon from
+CONFIG, a <jami-configuration> object."
+  (match-record config <jami-configuration>
+    (jamid dbus enable-logging? debug? auto-answer?)
+    `(,(file-append jamid "/lib/ring/dring")
+      "--persistent"                    ;stay alive after client quits
+      ,@(if enable-logging?
+            '()                         ;logs go to syslog by default
+            (list "--console"))         ;else stdout/stderr
+      ,@(if debug?
+            (list "--debug")
+            '())
+      ,@(if auto-answer?
+            (list "--auto-answer")
+            '()))))
+
+(define (jami-dbus-session-activation config)
+  "Create a directory to hold the Jami D-Bus session socket."
+  (with-imported-modules (source-module-closure '((gnu build activation)))
+    #~(begin
+        (use-modules (gnu build activation))
+        (let ((user (getpwnam "jami")))
+          (mkdir-p/perms "/var/run/jami" user #o700)))))
+
+(define (jami-shepherd-services config)
+  "Return a <shepherd-service> running the Jami daemon."
+  (let* ((jamid (jami-configuration-jamid config))
+         (nss-certs (jami-configuration-nss-certs config))
+         (dbus (jami-configuration-dbus config))
+         (dbus-daemon (file-append dbus "/bin/dbus-daemon"))
+         (dbus-send (file-append dbus "/bin/dbus-send"))
+         (accounts (jami-configuration-accounts config))
+         (declarative-mode? (not (eq? 'disabled accounts))))
+
+    (with-imported-modules (source-module-closure
+                            '((gnu build jami-service)
+                              (gnu build shepherd)
+                              (gnu system file-systems)))
+
+      (define list-accounts-action
+        (shepherd-action
+         (name 'list-accounts)
+         (documentation "List the available Jami accounts.  Return the account
+details alists keyed by their account username.")
+         (procedure
+          #~(lambda _
+              (parameterize ((%send-dbus-binary #$dbus-send)
+                             (%send-dbus-bus    "unix:path=/var/run/jami/bus")
+                             (%send-dbus-user   "jami")
+                             (%send-dbus-group  "jami"))
+                ;; Print the accounts summary or long listing, according to
+                ;; user-provided option.
+                (let* ((usernames (get-usernames))
+                       (accounts (map-in-order username->account usernames)))
+                  (match accounts
+                    (()                 ;empty list
+                     (format #t "There is no Jami account available.~%"))
+                    ((one two ...)
+                     (format #t "The following Jami accounts are available:~%")
+                     (for-each
+                      (lambda (account)
+                        (define fingerprint (assoc-ref account
+                                                       "Account.username"))
+                        (define human-friendly-name
+                          (or (assoc-ref account
+                                         "Account.registeredName")
+                              (assoc-ref account
+                                         "Account.displayName")
+                              (assoc-ref account
+                                         "Account.alias")))
+                        (define disabled?
+                          (and=> (assoc-ref account "Account.enable")
+                                 (cut string=? "false" <>)))
+
+                        (format #t "  - ~a~@[ (~a)~] ~:[~;[disabled]~]~%"
+                                fingerprint human-friendly-name disabled?))
+                      accounts)
+                     (display "\n")))
+                  ;; Return the account-details-list alist.
+                  (map cons usernames accounts)))))))
+
+      (define list-account-details-action
+        (shepherd-action
+         (name 'list-account-details)
+         (documentation "Display the account details of the available Jami
+accounts in the @code{recutils} format.  Return the account details alists
+keyed by their account username.")
+         (procedure
+          #~(lambda _
+              (parameterize ((%send-dbus-binary #$dbus-send)
+                             (%send-dbus-bus    "unix:path=/var/run/jami/bus")
+                             (%send-dbus-user   "jami")
+                             (%send-dbus-group  "jami"))
+                (let* ((usernames (get-usernames))
+                       (accounts (map-in-order username->account usernames)))
+                  (for-each (lambda (account)
+                              (display (account-details->recutil account))
+                              (display "\n\n"))
+                            accounts)
+                  (map cons usernames accounts)))))))
+
+      (define list-contacts-action
+        (shepherd-action
+         (name 'list-contacts)
+         (documentation "Display the contacts for each Jami account.  Return
+an alist containing the contacts keyed by the account usernames.")
+         (procedure
+          #~(lambda _
+              (parameterize ((%send-dbus-binary #$dbus-send)
+                             (%send-dbus-bus    "unix:path=/var/run/jami/bus")
+                             (%send-dbus-user   "jami")
+                             (%send-dbus-group  "jami"))
+                (let* ((usernames (get-usernames))
+                       (contacts (map-in-order username->contacts usernames)))
+                  (for-each (lambda (username contacts)
+                              (format #t "Contacts for account ~a:~%"
+                                      username)
+                              (format #t "~{  - ~a~%~}~%" contacts))
+                            usernames contacts)
+                  (map cons usernames contacts)))))))
+
+      (define list-moderators-action
+        (shepherd-action
+         (name 'list-moderators)
+         (documentation "Display the moderators for each Jami account.  Return
+an alist containing the moderators keyed by the account usernames.")
+         (procedure
+          #~(lambda _
+              (parameterize ((%send-dbus-binary #$dbus-send)
+                             (%send-dbus-bus    "unix:path=/var/run/jami/bus")
+                             (%send-dbus-user   "jami")
+                             (%send-dbus-group  "jami"))
+                (let* ((usernames (get-usernames))
+                       (moderators (map-in-order username->moderators
+                                                 usernames)))
+                  (for-each
+                   (lambda (username moderators)
+                     (if (username->all-moderators? username)
+                         (format #t "Anyone can moderate for account ~a~%"
+                                 username)
+                         (begin
+                           (format #t "Moderators for account ~a:~%" username)
+                           (format #t "~{  - ~a~%~}~%" moderators))))
+                   usernames moderators)
+                  (map cons usernames moderators)))))))
+
+      (define add-moderator-action
+        (shepherd-action
+         (name 'add-moderator)
+         (documentation "Add a moderator for a given Jami account.  The
+MODERATOR contact must be given as its 40 characters fingerprint, while the
+Jami account can be provided as its registered USERNAME or fingerprint.
+
+@example
+herd add-moderator jami 1dbcb0f5f37324228235564b79f2b9737e9a008f username
+@end example
+
+Return the moderators for the account known by USERNAME.")
+         (procedure
+          #~(lambda (_ moderator username)
+              (parameterize ((%send-dbus-binary #$dbus-send)
+                             (%send-dbus-bus    "unix:path=/var/run/jami/bus")
+                             (%send-dbus-user   "jami")
+                             (%send-dbus-group  "jami"))
+                (set-all-moderators #f username)
+                (add-contact moderator username)
+                (set-moderator moderator #t username)
+                (username->moderators username))))))
+
+      (define ban-contact-action
+        (shepherd-action
+         (name 'ban-contact)
+         (documentation "Ban a contact for a given or all Jami accounts, and
+clear their moderator flag.  The CONTACT must be given as its 40 characters
+fingerprint, while the Jami account can be provided as its registered USERNAME
+or fingerprint, or omitted.  When the account is omitted, CONTACT is banned
+from all accounts.
+
+@example
+herd ban-contact jami 1dbcb0f5f37324228235564b79f2b9737e9a008f [username]
+@end example")
+         (procedure
+          #~(lambda* (_ contact #:optional username)
+              (parameterize ((%send-dbus-binary #$dbus-send)
+                             (%send-dbus-bus    "unix:path=/var/run/jami/bus")
+                             (%send-dbus-user   "jami")
+                             (%send-dbus-group  "jami"))
+                (let ((usernames (or (and=> username list)
+                                     (get-usernames))))
+                  (for-each (lambda (username)
+                              (set-moderator contact #f username)
+                              (remove-contact contact username #:ban? #t))
+                            usernames)))))))
+
+      (define list-banned-contacts-action
+        (shepherd-action
+         (name 'list-banned-contacts)
+         (documentation "List the banned contacts for each accounts.  Return
+an alist of the banned contacts, keyed by the account usernames.")
+         (procedure
+          #~(lambda _
+              (parameterize ((%send-dbus-binary #$dbus-send)
+                             (%send-dbus-bus    "unix:path=/var/run/jami/bus")
+                             (%send-dbus-user   "jami")
+                             (%send-dbus-group  "jami"))
+
+                (define banned-contacts
+                  (let ((usernames (get-usernames)))
+                    (map cons usernames
+                         (map-in-order (lambda (x)
+                                         (receive (_ banned)
+                                             (username->contacts x)
+                                           banned))
+                                       usernames))))
+
+                (for-each (match-lambda
+                            ((username . banned)
+                             (unless (null? banned)
+                               (format #t "Banned contacts for account ~a:~%"
+                                       username)
+                               (format #t "~{  - ~a~%~}~%" banned))))
+                          banned-contacts)
+                banned-contacts)))))
+
+      (define enable-account-action
+        (shepherd-action
+         (name 'enable-account)
+         (documentation "Enable an account.  It takes USERNAME as an argument,
+either a registered username or the fingerprint of the account.")
+         (procedure
+          #~(lambda (_ username)
+              (parameterize ((%send-dbus-binary #$dbus-send)
+                             (%send-dbus-bus    "unix:path=/var/run/jami/bus")
+                             (%send-dbus-user   "jami")
+                             (%send-dbus-group  "jami"))
+                (enable-account username))))))
+
+      (define disable-account-action
+        (shepherd-action
+         (name 'disable-account)
+         (documentation "Disable an account.  It takes USERNAME as an
+argument, either a registered username or the fingerprint of the account.")
+         (procedure
+          #~(lambda (_ username)
+              (parameterize ((%send-dbus-binary #$dbus-send)
+                             (%send-dbus-bus    "unix:path=/var/run/jami/bus")
+                             (%send-dbus-user   "jami")
+                             (%send-dbus-group  "jami"))
+                (disable-account username))))))
+
+      (list (shepherd-service
+             (documentation "Run a D-Bus session for the Jami daemon.")
+             (provision '(jami-dbus-session))
+             (modules `((gnu build shepherd)
+                        (gnu build jami-service)
+                        (gnu system file-systems)
+                        ,@%default-modules))
+             ;; The requirement on dbus-system is to ensure other required
+             ;; activation for D-Bus, such as a /etc/machine-id file.
+             (requirement '(dbus-system syslogd))
+             (start
+              #~(lambda args
+                  (define pid
+                    ((make-forkexec-constructor/container
+                      (list #$dbus-daemon "--session"
+                            "--address=unix:path=/var/run/jami/bus"
+                            "--nofork" "--syslog-only" "--nopidfile")
+                      #:mappings (list (file-system-mapping
+                                        (source "/dev/log") ;for syslog
+                                        (target source))
+                                       (file-system-mapping
+                                        (source "/var/run/jami")
+                                        (target source)
+                                        (writable? #t)))
+                      #:user "jami"
+                      #:group "jami"
+                      #:environment-variables
+                      ;; This is so that the cx.ring.Ring service D-Bus
+                      ;; definition is found by dbus-send.
+                      (list (string-append "XDG_DATA_DIRS="
+                                           #$jamid "/share")))))
+
+                  ;; XXX: This manual synchronization probably wouldn't be
+                  ;; needed if we were using a PID file, but providing it via a
+                  ;; customized config file with <pidfile> would not override
+                  ;; the one inherited from the base config of D-Bus.
+                  (let ((sock (socket PF_UNIX SOCK_STREAM 0)))
+                    (with-retries 20 1 (catch 'system-error
+                                         (lambda ()
+                                           (connect sock AF_UNIX
+                                                    "/var/run/jami/bus")
+                                           (close-port sock)
+                                           #t)
+                                         (lambda args
+                                           #f))))
+
+                  pid))
+             (stop #~(make-kill-destructor)))
+
+            (shepherd-service
+             (documentation "Run the Jami daemon.")
+             (provision '(jami))
+             (actions (list list-accounts-action
+                            list-account-details-action
+                            list-contacts-action
+                            list-moderators-action
+                            add-moderator-action
+                            ban-contact-action
+                            list-banned-contacts-action
+                            enable-account-action
+                            disable-account-action))
+             (requirement '(jami-dbus-session))
+             (modules `((ice-9 format)
+                        (ice-9 ftw)
+                        (ice-9 match)
+                        (ice-9 receive)
+                        (srfi srfi-1)
+                        (srfi srfi-26)
+                        (gnu build jami-service)
+                        (gnu build shepherd)
+                        (gnu system file-systems)
+                        ,@%default-modules))
+             (start
+              #~(lambda args
+                  (define (delete-file-recursively/safe file)
+                    ;; Ensure we're not deleting things outside of
+                    ;; /var/lib/jami.  This prevents a possible attack in case
+                    ;; the daemon is compromised and an attacker gains write
+                    ;; access to /var/lib/jami.
+                    (let ((parent-directory (dirname file)))
+                      (if (eq? 'symlink (stat:type (stat parent-directory)))
+                          (error "abnormality detected; unexpected symlink found at"
+                                 parent-directory)
+                          (delete-file-recursively file))))
+
+                  (when #$declarative-mode?
+                    ;; Clear the Jami configuration and accounts, to enforce the
+                    ;; declared state.
+                    (catch #t
+                      (lambda ()
+                        (for-each (cut delete-file-recursively/safe <>)
+                                  '("/var/lib/jami/.cache/jami"
+                                    "/var/lib/jami/.config/jami"
+                                    "/var/lib/jami/.local/share/jami"
+                                    "/var/lib/jami/accounts")))
+                      (lambda args
+                        #t))
+                    ;; Copy the Jami account archives from somewhere readable
+                    ;; by root to a place only the jami user can read.
+                    (let* ((accounts-dir "/var/lib/jami/accounts/")
+                           (pwd (getpwnam "jami"))
+                           (user (passwd:uid pwd))
+                           (group (passwd:gid pwd)))
+                      (mkdir-p accounts-dir)
+                      (chown accounts-dir user group)
+                      (for-each (lambda (f)
+                                  (let ((dest (string-append accounts-dir
+                                                             (basename f))))
+                                    (copy-file f dest)
+                                    (chown dest user group)))
+                                '#$(and declarative-mode?
+                                        (map jami-account-archive accounts)))))
+
+                  ;; Start the daemon.
+                  (define daemon-pid
+                    ((make-forkexec-constructor/container
+                      '#$(jami-configuration->command-line-arguments config)
+                      #:mappings
+                      (list (file-system-mapping
+                             (source "/dev/log") ;for syslog
+                             (target source))
+                            (file-system-mapping
+                             (source "/var/lib/jami")
+                             (target source)
+                             (writable? #t))
+                            (file-system-mapping
+                             (source "/var/run/jami")
+                             (target source)
+                             (writable? #t))
+                            ;; Expose TLS certificates for GnuTLS.
+                            (file-system-mapping
+                             (source #$(file-append nss-certs "/etc/ssl/certs"))
+                             (target "/etc/ssl/certs")))
+                      #:user "jami"
+                      #:group "jami"
+                      #:environment-variables
+                      (list (string-append "DBUS_SESSION_BUS_ADDRESS="
+                                           "unix:path=/var/run/jami/bus")
+                            ;; Expose TLS certificates for OpenSSL.
+                            "SSL_CERT_DIR=/etc/ssl/certs"))))
+
+                  (parameterize ((%send-dbus-binary #$dbus-send)
+                                 (%send-dbus-bus    "unix:path=/var/run/jami/bus")
+                                 (%send-dbus-user   "jami")
+                                 (%send-dbus-group  "jami"))
+
+                    ;; Wait until the service name has been acquired by D-Bus.
+                    (with-retries 20 1
+                      (dbus-service-available? "cx.ring.Ring"))
+
+                    (when #$declarative-mode?
+                      ;; Provision the accounts via the D-Bus API of the daemon.
+                      (let* ((jami-account-archives
+                              (map (cut string-append
+                                        "/var/lib/jami/accounts/" <>)
+                                   (scandir "/var/lib/jami/accounts/"
+                                            (lambda (f)
+                                              (not (member f '("." "..")))))))
+                             (usernames (map-in-order (cut add-account <>)
+                                                      jami-account-archives)))
+
+                        (define (archive-name->username archive)
+                          (list-ref
+                           usernames
+                           (list-index (lambda (f)
+                                         (string-suffix? (basename archive) f))
+                                       jami-account-archives)))
+
+                        (for-each
+                         (lambda (archive allowed-contacts moderators
+                                          account-details)
+                           (let ((username (archive-name->username
+                                            archive)))
+                             (when (not (eq? 'disabled allowed-contacts))
+                               ;; Reject calls from unknown contacts.
+                               (set-account-details
+                                '(("DHT.PublicInCalls" . "false")) username)
+                               ;; Remove all contacts.
+                               (for-each (cut remove-contact <> username)
+                                         (username->contacts username))
+                               ;; Add allowed ones.
+                               (for-each (cut add-contact <> username)
+                                         allowed-contacts))
+                             (when (not (eq? 'disabled moderators))
+                               ;; Disable the 'AllModerators' property.
+                               (set-all-moderators #f username)
+                               ;; Remove all moderators.
+                               (for-each (cut set-moderator <> #f username)
+                                         (username->moderators username))
+                               ;; Add declared moderators.
+                               (for-each (cut set-moderator <> #t username)
+                                         moderators))
+                             ;; Set the various account parameters.
+                             (set-account-details account-details username)))
+                         '#$(and declarative-mode?
+                                 (map-in-order (cut jami-account-archive <>)
+                                               accounts))
+                         '#$(and declarative-mode?
+                                 (map-in-order
+                                  (cut jami-account-allowed-contacts <>)
+                                  accounts))
+                         '#$(and declarative-mode?
+                                 (map-in-order (cut jami-account-moderators <>)
+                                               accounts))
+                         '#$(and declarative-mode?
+                                 (map-in-order jami-account->alist accounts))))))
+
+                  ;; Finally, return the PID of the daemon process.
+                  daemon-pid))
+             (stop
+              #~(lambda (pid . args)
+                  (kill pid SIGKILL)
+                  ;; Wait for the process to exit; this prevents overlapping
+                  ;; processes when issuing 'herd restart'.
+                  (waitpid pid)
+                  #f)))))))
+
+(define jami-service-type
+  (service-type
+   (name 'jami)
+   (default-value (jami-configuration))
+   (extensions
+    (list (service-extension shepherd-root-service-type
+                             jami-shepherd-services)
+          (service-extension account-service-type
+                             (const %jami-accounts))
+          (service-extension activation-service-type
+                             jami-dbus-session-activation)))
+   (description "Run the Jami daemon (@command{dring}).  This service is
+geared toward the use case of hosting Jami rendezvous points over a headless
+server.  If you use Jami on your local machine, you may prefer to setup a user
+Shepherd service for it instead; this way, the daemon will be shared via your
+normal user D-Bus session bus.")))
+
+
+;;;
+;;; Murmur.
+;;;
+
 ;; https://github.com/mumble-voip/mumble/blob/master/scripts/murmur.ini
 
 (define-record-type* <murmur-configuration> murmur-configuration
@@ -305,3 +981,7 @@ suite.")
                        (service-extension account-service-type
                                           murmur-accounts)))
                 (default-value (murmur-configuration))))
+
+;; Local Variables:
+;; eval: (put 'with-retries 'scheme-indent-function 2)
+;; End:
diff --git a/gnu/tests/data/jami-dummy-account.dat b/gnu/tests/data/jami-dummy-account.dat
new file mode 100644
index 0000000000..0e908396ca
--- /dev/null
+++ b/gnu/tests/data/jami-dummy-account.dat
@@ -0,0 +1,392 @@
+;;; -*- mode: scheme; -*-
+;;; JSON extracted from an actual Jami account and processed with
+;;; Emacs/guile-json.
+(define %jami-account-content-sexp
+  '(("RINGCAKEY" . "LS0tLS1CRUdJTiBQUklWQVRFIEtFWS0tLS0tCk1JSUpRd0lCQURBTkJna3F\
+oa2lHOXcwQkFRRUZBQVNDQ1Mwd2dna3BBZ0VBQW9JQ0FRQzBxWUozSkYvTzhQRGEKRnUwRnpRcHBCaD\
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+jc2cytQTEFlcjlOZGpVQzQ2ZXp0UnNiNE9aQXc4ZUk1M3EwSU04QWJFd0o0ZjllLzBmQUFueHgrK3Qw\
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+5RGZKSU0KOC9PRy8rMndNamI4WkRwT3JrYy93U2ZHbnQyZXA3U0xKSkgwOFIzV1FKWklsSndrcGdLTH\
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+hIMmhVWkNuV0kxMDM5SmdyRkxMczFSU1krSzg1aFZYMk9hV1VTNk44TmNCYzUyL1hrdFltS09HUFQKM\
+WZqMnE2M3pPcDNSSFdGNWVPMXhNeExRN3JZSDhqMGZZTFFTUytKemdwb3ZRVnJLSXkrb21JSSt3aUN6\
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+S0K")
+    ("ethKey" . "fN8cOT1lYNziaW0+pjBIgZ8r6+zMMhHsukkWBNPDsFo=")
+    ("TURN.username" . "ring")
+    ("TURN.server" . "turn.jami.net")
+    ("TURN.realm" . "ring")
+    ("TURN.password" . "ring")
+    ("TURN.enable" . "true")
+    ("TLS.verifyServer" . "true")
+    ("TLS.verifyClient" . "true")
+    ("TLS.serverName" . "")
+    ("TLS.requireClientCertificate" . "true")
+    ("TLS.privateKeyFile" . "LS0tLS1CRUdJTiBQUklWQVRFIEtFWS0tLS0tCk1JSUpRd0lCQU\
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+    ("TLS.password" . "")
+    ("TLS.negotiationTimeoutSec" . "-1")
+    ("TLS.method" . "Automatic")
+    ("TLS.ciphers" . "")
+    ("TLS.certificateFile" . "LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCk1JSUZHVENDQ\
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+    ("STUN.server" . "")
+    ("STUN.enable" . "false")
+    ("SRTP.rtpFallback" . "false")
+    ("SRTP.keyExchange" . "sdes")
+    ("SRTP.enable" . "true")
+    ("RingNS.uri" . "")
+    ("RingNS.account" . "0790738ce15fa05933b49dd77034312787da86c3")
+    ("DHT.PublicInCalls" . "true")
+    ("Account.videoPortMin" . "49152")
+    ("Account.videoPortMax" . "65534")
+    ("Account.videoEnabled" . "true")
+    ("Account.username" . "f3345f2775ddfe07a4b0d95daea111d15fbc1199")
+    ("Account.useragent" . "")
+    ("Account.upnpEnabled" . "true")
+    ("Account.type" . "RING")
+    ("Account.ringtoneEnabled" . "true")
+    ("Account.rendezVous" . "true")
+    ("Account.publishedSameAsLocal" . "true")
+    ("Account.publishedPort" . "5060")
+    ("Account.publishedAddress" . "")
+    ("Account.presenceSubscribeSupported" . "true")
+    ("Account.peerDiscovery" . "false")
+    ("Account.managerUsername" . "")
+    ("Account.managerUri" . "")
+    ("Account.mailbox" . "")
+    ("Account.localModeratorsEnabled" . "true")
+    ("Account.localInterface" . "default")
+    ("Account.hostname" . "bootstrap.jami.net")
+    ("Account.hasCustomUserAgent" . "false")
+    ("Account.enable" . "true")
+    ("Account.dtmfType" . "overrtp")
+    ("Account.displayName" . "dummy")
+    ("Account.defaultModerators" . "")
+    ("Account.audioPortMin" . "16384")
+    ("Account.audioPortMax" . "32766")
+    ("Account.archiveHasPassword" . "false")
+    ("Account.allowCertFromTrusted" . "true")
+    ("Account.allowCertFromHistory" . "true")
+    ("Account.allowCertFromContact" . "true")
+    ("Account.allModeratorEnabled" . "true")
+    ("Account.alias" . "dummy")
+    ("Account.activeCallLimit" . "-1")
+    ("Account.accountPublish" . "false")
+    ("Account.accountDiscovery" . "false")))
diff --git a/gnu/tests/telephony.scm b/gnu/tests/telephony.scm
new file mode 100644
index 0000000000..1155a9dbc2
--- /dev/null
+++ b/gnu/tests/telephony.scm
@@ -0,0 +1,366 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2021 Maxim Cournoyer <[email-masked]>.
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu tests telephony)
+  #:use-module (gnu)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages guile)
+  #:use-module (gnu tests)
+  #:use-module (gnu system vm)
+  #:use-module (gnu services)
+  #:use-module (gnu services dbus)
+  #:use-module (gnu services networking)
+  #:use-module (gnu services ssh)
+  #:use-module (gnu services telephony)
+  #:use-module (guix gexp)
+  #:use-module (guix modules)
+  #:export (%test-jami
+            %test-jami-provisioning))
+
+;;;
+;;; Jami daemon.
+;;;
+
+(include "data/jami-dummy-account.dat") ;defines %jami-account-content-sexp
+
+(define %dummy-jami-account-archive
+  ;; A Jami account archive is a gzipped JSON file.
+  (computed-file
+   "dummy-jami-account.gz"
+   (with-extensions (list guile-json-4 guile-zlib)
+     #~(begin
+         (use-modules (json) (zlib))
+         (let ((port (open-output-file #$output)))
+           (call-with-gzip-output-port port
+             (lambda (port)
+               (scm->json '#$%jami-account-content-sexp port))))))))
+
+(define %allowed-contacts '("1dbcb0f5f37324228235564b79f2b9737e9a008f"
+                            "2dbcb0f5f37324228235564b79f2b9737e9a008f"))
+
+(define %moderators '("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+                      "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"))
+
+(define %dummy-jami-account (jami-account
+                             (archive %dummy-jami-account-archive)
+                             (allowed-contacts %allowed-contacts)
+                             (moderators %moderators)
+                             (rendezvous-point? #t)
+                             (peer-discovery? #f)
+                             (bootstrap-hostnames '("bootstrap.me"
+                                                    "fallback.another.host"))
+                             (name-server-uri "https://my.name.server")))
+
+(define* (make-jami-os #:key provisioning?)
+  (operating-system
+    (host-name "jami")
+    (timezone "America/Montreal")
+    (locale "en_US.UTF-8")
+
+    (bootloader (bootloader-configuration
+                 (bootloader grub-bootloader)
+                 (target "/dev/sdX")))
+    (file-systems (cons (file-system
+                          (device (file-system-label "my-root"))
+                          (mount-point "/")
+                          (type "ext4"))
+                        %base-file-systems))
+    (firmware '())
+
+    (services (cons* (service jami-service-type
+                              (if provisioning?
+                                  (jami-configuration
+                                   (debug? #t)
+                                   (accounts (list %dummy-jami-account)))
+                                  (jami-configuration
+                                   (debug? #t))))
+                     (service dbus-root-service-type)
+                     ;; The following services/packages are added for
+                     ;; debugging purposes.
+                     (service dhcp-client-service-type)
+                     (service openssh-service-type
+                              (openssh-configuration
+                               (permit-root-login #t)
+                               (allow-empty-passwords? #t)))
+                     %base-services))
+    (packages (cons* (specification->package "recutils")
+                     (specification->package "strace")
+                     %base-packages))))
+
+(define %jami-os
+  (make-jami-os))
+
+(define %jami-os-provisioning
+  (make-jami-os #:provisioning? #t))
+
+(define* (run-jami-test #:key provisioning?)
+  "Run tests in %JAMI-OS.  When PROVISIONING? is true, test the
+accounts provisioning feature of the service."
+  (define os (marionette-operating-system
+              (if provisioning?
+                  %jami-os-provisioning
+                  %jami-os)
+              #:imported-modules '((gnu services herd)
+                                   (guix combinators))))
+  (define vm (virtual-machine
+              (operating-system os)
+              (memory-size 512)))
+
+  (define username (assoc-ref %jami-account-content-sexp
+                              "Account.username"))
+
+  (define test
+    (with-imported-modules (source-module-closure
+                            '((gnu build marionette)
+                              (gnu build jami-service)))
+      #~(begin
+          (use-modules (rnrs base)
+                       (srfi srfi-11)
+                       (srfi srfi-64)
+                       (gnu build marionette)
+                       (gnu build jami-service))
+
+          (define marionette
+            (make-marionette (list #$vm)))
+
+          (mkdir #$output)
+          (chdir #$output)
+
+          (test-begin "jami")
+
+          (test-assert "service is running"
+            (marionette-eval
+             '(begin
+                (use-modules (gnu services herd))
+                (match (start-service 'jami)
+                  (#f #f)
+                  (('service response-parts ...)
+                   (match (assq-ref response-parts 'running)
+                     ((pid) (number? pid))))))
+             marionette))
+
+          (test-assert "service can be stopped"
+            (marionette-eval
+             '(begin
+                (use-modules (gnu services herd)
+                             (rnrs base))
+                (setenv "PATH" "/run/current-system/profile/bin")
+                (let ((pid (match (start-service 'jami)
+                             (#f #f)
+                             (('service response-parts ...)
+                              (match (assq-ref response-parts 'running)
+                                ((pid) pid))))))
+
+                  (assert (number? pid))
+
+                  (match (stop-service 'jami)
+                    (services           ;a list of service symbols
+                     (member 'jami services)))
+                  ;; Sometimes, the process still appear in pgrep, even
+                  ;; though we are using waitpid after sending it SIGTERM
+                  ;; in the service; use retries.
+                  (with-retries 20 1
+                    (not (zero? (status:exit-val
+                                 (system* "pgrep" "dring")))))))
+             marionette))
+
+          (test-assert "service can be restarted"
+            (marionette-eval
+             '(begin
+                (use-modules (gnu services herd)
+                             (rnrs base))
+                ;; Start and retrieve the current PID.
+                (define pid (match (start-service 'jami)
+                              (#f #f)
+                              (('service response-parts ...)
+                               (match (assq-ref response-parts 'running)
+                                 ((pid) pid)))))
+                (assert (number? pid))
+
+                ;; Restart the service.
+                (restart-service 'jami)
+
+                (define new-pid (match (start-service 'jami)
+                                  (#f #f)
+                                  (('service response-parts ...)
+                                   (match (assq-ref response-parts 'running)
+                                     ((pid) pid)))))
+                (assert (number? new-pid))
+
+                (not (eq? pid new-pid)))
+             marionette))
+
+          (unless #$provisioning? (test-skip 1))
+          (test-assert "jami accounts provisioning, account present"
+            (marionette-eval
+             '(begin
+                (use-modules (gnu services herd)
+                             (rnrs base))
+                ;; Accounts take some time to appear after being added.
+                (with-retries 20 1
+                  (with-shepherd-action 'jami ('list-accounts) results
+                    (let ((account (assoc-ref (car results) #$username)))
+                      (assert (string=? #$username
+                                        (assoc-ref account
+                                                   "Account.username")))))))
+             marionette))
+
+          (unless #$provisioning? (test-skip 1))
+          (test-assert "jami accounts provisioning, allowed-contacts"
+            (marionette-eval
+             '(begin
+                (use-modules (gnu services herd)
+                             (rnrs base)
+                             (srfi srfi-1))
+
+                ;; Public mode is disabled.
+                (with-shepherd-action 'jami ('list-account-details)
+                                      results
+                  (let ((account (assoc-ref (car results) #$username)))
+                    (assert (string=? "false"
+                                      (assoc-ref account
+                                                 "DHT.PublicInCalls")))))
+
+                ;; Allowed contacts match those declared in the configuration.
+                (with-shepherd-action 'jami ('list-contacts) results
+                  (let ((contacts (assoc-ref (car results) #$username)))
+                    (assert (lset= string-ci=? contacts '#$%allowed-contacts)))))
+             marionette))
+
+          (unless #$provisioning? (test-skip 1))
+          (test-assert "jami accounts provisioning, moderators"
+            (marionette-eval
+             '(begin
+                (use-modules (gnu services herd)
+                             (rnrs base)
+                             (srfi srfi-1))
+
+                ;; Moderators match those declared in the configuration.
+                (with-shepherd-action 'jami ('list-moderators) results
+                  (let ((moderators (assoc-ref (car results) #$username)))
+                    (assert (lset= string-ci=? moderators '#$%moderators))))
+
+                ;; Moderators can be added via the Shepherd action.
+                (with-shepherd-action 'jami
+                    ('add-moderator "cccccccccccccccccccccccccccccccccccccccc"
+                                    #$username) results
+                  (let ((moderators (car results)))
+                    (assert (lset= string-ci=? moderators
+                                   (cons "cccccccccccccccccccccccccccccccccccccccc"
+                                         '#$%moderators))))))
+             marionette))
+
+          (unless #$provisioning? (test-skip 1))
+          (test-assert "jami service actions, ban/unban contacts"
+            (marionette-eval
+             '(begin
+                (use-modules (gnu services herd)
+                             (rnrs base)
+                             (srfi srfi-1))
+
+                ;; Globally ban a contact.
+                (with-shepherd-action 'jami
+                    ('ban-contact "1dbcb0f5f37324228235564b79f2b9737e9a008f") _
+                  (with-shepherd-action 'jami ('list-banned-contacts) results
+                    (every (match-lambda
+                             ((username . banned-contacts)
+                              (member "1dbcb0f5f37324228235564b79f2b9737e9a008f"
+                                      banned-contacts)))
+                           (car results))))
+
+                ;; Ban a contact for a single account.
+                (with-shepherd-action 'jami
+                    ('ban-contact "dddddddddddddddddddddddddddddddddddddddd"
+                                  #$username) _
+                  (with-shepherd-action 'jami ('list-banned-contacts) results
+                    (every (match-lambda
+                             ((username . banned-contacts)
+                              (let ((found? (member "dddddddddddddddddddddddddddddddddddddddd"
+                                                    banned-contacts)))
+                                (if (string=? #$username username)
+                                    found?
+                                    (not found?)))))
+                           (car results)))))
+             marionette))
+
+          (unless #$provisioning? (test-skip 1))
+          (test-assert "jami service actions, enable/disable accounts"
+            (marionette-eval
+             '(begin
+                (use-modules (gnu services herd)
+                             (rnrs base))
+
+                (with-shepherd-action 'jami
+                    ('disable-account #$username) _
+                  (with-shepherd-action 'jami ('list-accounts) results
+                    (let ((account (assoc-ref (car results) #$username)))
+                      (assert (string= "false"
+                                       (assoc-ref account "Account.enable"))))))
+
+                (with-shepherd-action 'jami
+                    ('enable-account #$username) _
+                  (with-shepherd-action 'jami ('list-accounts) results
+                    (let ((account (assoc-ref (car results) #$username)))
+                      (assert (string= "true"
+                                       (assoc-ref account "Account.enable")))))))
+             marionette))
+
+          (unless #$provisioning? (test-skip 1))
+          (test-assert "jami account parameters"
+            (marionette-eval
+             '(begin
+                (use-modules (gnu services herd)
+                             (rnrs base)
+                             (srfi srfi-1))
+
+                (with-shepherd-action 'jami ('list-account-details) results
+                  (let ((account-details (assoc-ref (car results)
+                                                    #$username)))
+                    (assert (lset<=
+                             equal?
+                             '(("Account.hostname" .
+                                "bootstrap.me;fallback.another.host")
+                               ("Account.peerDiscovery" . "false")
+                               ("Account.rendezVous" . "true")
+                               ("RingNS.uri" . "https://my.name.server"))
+                             account-details)))))
+             marionette))
+
+          (test-end)
+          (exit (= (test-runner-fail-count (test-runner-current)) 0)))))
+
+  (gexp->derivation (if provisioning?
+                        "jami-provisioning-test"
+                        "jami-test")
+    test))
+
+(define %test-jami
+  (system-test
+   (name "jami")
+   (description "Basic tests for the jami service.")
+   (value (run-jami-test))))
+
+(define %test-jami-provisioning
+  (system-test
+   (name "jami-provisioning")
+   (description "Provisioning test for the jami service.")
+   (value (run-jami-test #:provisioning? #t))))
+
+;; Local Variables:
+;; eval: (put 'with-retries 'scheme-indent-function 2)
+;; End:
diff --git a/tests/services/telephony.scm b/tests/services/telephony.scm
new file mode 100644
index 0000000000..b4a0f120d4
--- /dev/null
+++ b/tests/services/telephony.scm
@@ -0,0 +1,446 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2021 Maxim Cournoyer <[email-masked]>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (tests services telephony)
+  #:use-module (gnu build jami-service)
+  #:use-module (gnu services telephony)
+  #:use-module (srfi srfi-64))
+
+;;; Tests for the (gnu services telephony) and related modules.
+
+(test-begin "jami-service")
+
+(define parse-dbus-reply
+  (@@ (gnu build jami-service) parse-dbus-reply))
+
+(define parse-account-ids
+  (@@ (gnu build jami-service) parse-account-ids))
+
+(define parse-account-details
+  (@@ (gnu build jami-service) parse-account-details))
+
+(define parse-contacts
+  (@@ (gnu build jami-service) parse-contacts))
+
+(define jami-account->alist
+  (@@ (gnu services telephony) jami-account->alist))
+
+;; $ dbus-send --print-reply --dest="cx.ring.Ring" \
+;; "/cx/ring/Ring/ConfigurationManager" \
+;; "cx.ring.Ring.ConfigurationManager.getAccountList"
+(define getAccountList-reply "\
+method return time=1622217253.386711 sender=:1.7 -> destination=:1.14 serial=140 reply_serial=2
+   array [
+      string \"addf37fbb558d6a0\"
+      string \"d5cbeb7d08c98a65\"
+      string \"398af0c6b74ce101\"
+   ]
+")
+
+(test-equal "parse-account-ids"
+  '("addf37fbb558d6a0" "d5cbeb7d08c98a65" "398af0c6b74ce101")
+  (parse-account-ids getAccountList-reply))
+
+;; $ dbus-send --print-reply --dest="cx.ring.Ring" \
+;; "/cx/ring/Ring/ConfigurationManager" \
+;; "cx.ring.Ring.ConfigurationManager.getAccountDetails" \
+;; 'string:398af0c6b74ce101'
+(define getAccountDetails-reply "\
+method return time=1622254991.789588 sender=:1.7 -> destination=:1.19 serial=145 reply_serial=2
+   array [
+      dict entry(
+         string \"Account.accountDiscovery\"
+         string \"false\"
+      )
+      dict entry(
+         string \"Account.accountPublish\"
+         string \"false\"
+      )
+      dict entry(
+         string \"Account.activeCallLimit\"
+         string \"-1\"
+      )
+      dict entry(
+         string \"Account.alias\"
+         string \"some-rendezvous-point-name\"
+      )
+      dict entry(
+         string \"Account.allModeratorEnabled\"
+         string \"true\"
+      )
+      dict entry(
+         string \"Account.allowCertFromContact\"
+         string \"true\"
+      )
+      dict entry(
+         string \"Account.allowCertFromHistory\"
+         string \"true\"
+      )
+      dict entry(
+         string \"Account.allowCertFromTrusted\"
+         string \"true\"
+      )
+      dict entry(
+         string \"Account.archiveHasPassword\"
+         string \"false\"
+      )
+      dict entry(
+         string \"Account.audioPortMax\"
+         string \"32766\"
+      )
+      dict entry(
+         string \"Account.audioPortMin\"
+         string \"16384\"
+      )
+      dict entry(
+         string \"Account.autoAnswer\"
+         string \"false\"
+      )
+      dict entry(
+         string \"Account.defaultModerators\"
+         string \"\"
+      )
+      dict entry(
+         string \"Account.deviceID\"
+         string \"94b4070fc7a8afa8482c777a9822c52e6af2e1bd\"
+      )
+      dict entry(
+         string \"Account.deviceName\"
+         string \"some-device\"
+      )
+      dict entry(
+         string \"Account.dhtProxyListUrl\"
+         string \"https://config.jami.net/proxyList\"
+      )
+      dict entry(
+         string \"Account.displayName\"
+         string \"some-rendezvous-point-name\"
+      )
+      dict entry(
+         string \"Account.dtmfType\"
+         string \"overrtp\"
+      )
+      dict entry(
+         string \"Account.enable\"
+         string \"true\"
+      )
+      dict entry(
+         string \"Account.hasCustomUserAgent\"
+         string \"false\"
+      )
+      dict entry(
+         string \"Account.hostname\"
+         string \"bootstrap.jami.net\"
+      )
+      dict entry(
+         string \"Account.localInterface\"
+         string \"default\"
+      )
+      dict entry(
+         string \"Account.localModeratorsEnabled\"
+         string \"true\"
+      )
+      dict entry(
+         string \"Account.mailbox\"
+         string \"\"
+      )
+      dict entry(
+         string \"Account.managerUri\"
+         string \"\"
+      )
+      dict entry(
+         string \"Account.managerUsername\"
+         string \"\"
+      )
+      dict entry(
+         string \"Account.peerDiscovery\"
+         string \"false\"
+      )
+      dict entry(
+         string \"Account.presenceSubscribeSupported\"
+         string \"true\"
+      )
+      dict entry(
+         string \"Account.proxyEnabled\"
+         string \"false\"
+      )
+      dict entry(
+         string \"Account.proxyPushToken\"
+         string \"\"
+      )
+      dict entry(
+         string \"Account.proxyServer\"
+         string \"dhtproxy.jami.net:[80-95]\"
+      )
+      dict entry(
+         string \"Account.publishedAddress\"
+         string \"\"
+      )
+      dict entry(
+         string \"Account.publishedPort\"
+         string \"5060\"
+      )
+      dict entry(
+         string \"Account.publishedSameAsLocal\"
+         string \"true\"
+      )
+      dict entry(
+         string \"Account.rendezVous\"
+         string \"true\"
+      )
+      dict entry(
+         string \"Account.ringtoneEnabled\"
+         string \"true\"
+      )
+      dict entry(
+         string \"Account.ringtonePath\"
+         string \"/usr/share/ring/ringtones/default.opus\"
+      )
+      dict entry(
+         string \"Account.type\"
+         string \"RING\"
+      )
+      dict entry(
+         string \"Account.upnpEnabled\"
+         string \"true\"
+      )
+      dict entry(
+         string \"Account.useragent\"
+         string \"\"
+      )
+      dict entry(
+         string \"Account.username\"
+         string \"ccb8bbe2382343f7feb140710ab48aaf1b55634e\"
+      )
+      dict entry(
+         string \"Account.videoEnabled\"
+         string \"true\"
+      )
+      dict entry(
+         string \"Account.videoPortMax\"
+         string \"65534\"
+      )
+      dict entry(
+         string \"Account.videoPortMin\"
+         string \"49152\"
+      )
+      dict entry(
+         string \"DHT.PublicInCalls\"
+         string \"true\"
+      )
+      dict entry(
+         string \"DHT.port\"
+         string \"7766\"
+      )
+      dict entry(
+         string \"RingNS.account\"
+         string \"3989b55313a911b6f0c004748b49b254f35c9ef6\"
+      )
+      dict entry(
+         string \"RingNS.uri\"
+         string \"\"
+      )
+      dict entry(
+         string \"SRTP.enable\"
+         string \"true\"
+      )
+      dict entry(
+         string \"SRTP.keyExchange\"
+         string \"sdes\"
+      )
+      dict entry(
+         string \"SRTP.rtpFallback\"
+         string \"false\"
+      )
+      dict entry(
+         string \"STUN.enable\"
+         string \"false\"
+      )
+      dict entry(
+         string \"STUN.server\"
+         string \"\"
+      )
+      dict entry(
+         string \"TLS.certificateFile\"
+         string \"/var/lib/jami/.local/share/jami/398af0c6b74ce101/ring_device.crt\"
+      )
+      dict entry(
+         string \"TLS.certificateListFile\"
+         string \"\"
+      )
+      dict entry(
+         string \"TLS.ciphers\"
+         string \"\"
+      )
+      dict entry(
+         string \"TLS.method\"
+         string \"Automatic\"
+      )
+      dict entry(
+         string \"TLS.negotiationTimeoutSec\"
+         string \"-1\"
+      )
+      dict entry(
+         string \"TLS.password\"
+         string \"\"
+      )
+      dict entry(
+         string \"TLS.privateKeyFile\"
+         string \"/var/lib/jami/.local/share/jami/398af0c6b74ce101/ring_device.key\"
+      )
+      dict entry(
+         string \"TLS.requireClientCertificate\"
+         string \"true\"
+      )
+      dict entry(
+         string \"TLS.serverName\"
+         string \"\"
+      )
+      dict entry(
+         string \"TLS.verifyClient\"
+         string \"true\"
+      )
+      dict entry(
+         string \"TLS.verifyServer\"
+         string \"true\"
+      )
+      dict entry(
+         string \"TURN.enable\"
+         string \"true\"
+      )
+      dict entry(
+         string \"TURN.password\"
+         string \"ring\"
+      )
+      dict entry(
+         string \"TURN.realm\"
+         string \"ring\"
+      )
+      dict entry(
+         string \"TURN.server\"
+         string \"turn.jami.net\"
+      )
+      dict entry(
+         string \"TURN.username\"
+         string \"ring\"
+      )
+   ]
+")
+
+(test-equal "parse-account-details; username, alias and display name"
+  '("ccb8bbe2382343f7feb140710ab48aaf1b55634e" ;username
+    "some-rendezvous-point-name"               ;alias
+    "some-rendezvous-point-name")              ;displayName
+  (let ((account-details (parse-account-details getAccountDetails-reply)))
+    (list (assoc-ref account-details "Account.username")
+          (assoc-ref account-details "Account.alias")
+          (assoc-ref account-details "Account.displayName"))))
+
+(define getContacts-reply "\
+method return time=1627014042.752673 sender=:1.113 -> destination=:1.186 serial=220 reply_serial=2
+   array [
+      array [
+         dict entry(
+            string \"added\"
+            string \"1578883327\"
+         )
+         dict entry(
+            string \"confirmed\"
+            string \"true\"
+         )
+         dict entry(
+            string \"id\"
+            string \"1c7d5a09464223442549fef172a3cf6f4de9b01c\"
+         )
+      ]
+      array [
+         dict entry(
+            string \"added\"
+            string \"1623107941\"
+         )
+         dict entry(
+            string \"confirmed\"
+            string \"true\"
+         )
+         dict entry(
+            string \"id\"
+            string \"5903c6c9ac5cb863c64e559add3d5d1c8c563449\"
+         )
+      ]
+      array [
+         dict entry(
+            string \"added\"
+            string \"1595996256\"
+         )
+         dict entry(
+            string \"confirmed\"
+            string \"true\"
+         )
+         dict entry(
+            string \"id\"
+            string \"ff2d72a548693214fb3a0f0f7a943b5e2bb9be03\"
+         )
+      ]
+   ]")
+
+(test-equal "parse-account-contacts"
+  '((("added" . "1578883327")
+     ("confirmed" . "true")
+     ("id" . "1c7d5a09464223442549fef172a3cf6f4de9b01c"))
+    (("added" . "1623107941")
+     ("confirmed" . "true")
+     ("id" . "5903c6c9ac5cb863c64e559add3d5d1c8c563449"))
+    (("added" . "1595996256")
+     ("confirmed" . "true")
+     ("id" . "ff2d72a548693214fb3a0f0f7a943b5e2bb9be03")))
+  (parse-contacts getContacts-reply))
+
+(define getContacts-empty-reply "\
+method return time=1627400787.873988 sender=:1.1197 -> destination=:1.1463 serial=2127 reply_serial=2
+   array [
+   ]")
+
+(test-equal "parse-account-contacts, empty array"
+  '()
+  (parse-contacts getContacts-empty-reply))
+
+(define %dummy-jami-account (jami-account
+                             (archive "/tmp/dummy.gz")))
+
+(define %dummy-jami-account-2 (jami-account
+                               (archive "/tmp/dummy.gz")
+                               (rendezvous-point? #t)
+                               (peer-discovery? #f)
+                               (bootstrap-hostnames '("bootstrap.me"
+                                                      "fallback.another.host"))
+                               (name-server-uri "https://my.name.server")))
+
+(test-equal "jami-account->alist, no account detail value set"
+  '()
+  (jami-account->alist %dummy-jami-account))
+
+(test-equal "jami-account->alist, with account detail values"
+  '(("Account.hostname" . "bootstrap.me;fallback.another.host")
+    ("Account.peerDiscovery" . "false")
+    ("Account.rendezVous" . "true")
+    ("RingNS.uri" . "https://my.name.server"))
+  (sort (jami-account->alist %dummy-jami-account-2)
+        (lambda (x y)
+          (string<=? (car x) (car y)))))
+
+(test-end)
-- 
2.32.0