diff --git a/nixos/modules/misc/ids.nix b/nixos/modules/misc/ids.nix
index dcefd1c51a7f..fcbac4c7f543 100644
--- a/nixos/modules/misc/ids.nix
+++ b/nixos/modules/misc/ids.nix
@@ -217,6 +217,7 @@
       ihaskell = 189;
       i2p = 190;
       lambdabot = 191;
+      asterisk = 192;
 
       # When adding a uid, make sure it doesn't match an existing gid. And don't use uids above 399!
 
@@ -411,6 +412,7 @@
       ihaskell = 189;
       i2p = 190;
       lambdabot = 191;
+      #asterisk = 192; # unused
 
       # When adding a gid, make sure it doesn't match an existing
       # uid. Users and groups with the same name should have equal
diff --git a/nixos/modules/module-list.nix b/nixos/modules/module-list.nix
index a1bb9b89f38f..08b232272ffe 100644
--- a/nixos/modules/module-list.nix
+++ b/nixos/modules/module-list.nix
@@ -242,6 +242,7 @@
   ./services/network-filesystems/yandex-disk.nix
   ./services/networking/aiccu.nix
   ./services/networking/amuled.nix
+  ./services/networking/asterisk.nix
   ./services/networking/atftpd.nix
   ./services/networking/avahi-daemon.nix
   ./services/networking/bind.nix
diff --git a/nixos/modules/services/networking/asterisk.nix b/nixos/modules/services/networking/asterisk.nix
new file mode 100644
index 000000000000..b079cb227303
--- /dev/null
+++ b/nixos/modules/services/networking/asterisk.nix
@@ -0,0 +1,223 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.asterisk;
+
+  asteriskUser = "asterisk";
+
+  varlibdir = "/var/lib/asterisk";
+  spooldir = "/var/spool/asterisk";
+  logdir = "/var/log/asterisk";
+
+  asteriskEtc = pkgs.stdenv.mkDerivation
+  ((mapAttrs' (name: value: nameValuePair
+        # Fudge the names to make bash happy
+        ((replaceChars ["."] ["_"] name) + "_")
+        (value)
+      ) cfg.confFiles) //
+  {
+    confFilesString = concatStringsSep " " (
+      attrNames cfg.confFiles
+    );
+
+    name = "asterisk.etc";
+
+    # Default asterisk.conf file
+    # (Notice that astetcdir will be set to the path of this derivation)
+    asteriskConf = ''
+      [directories]
+      astetcdir => @out@
+      astmoddir => ${pkgs.asterisk}/lib/asterisk/modules
+      astvarlibdir => /var/lib/asterisk
+      astdbdir => /var/lib/asterisk
+      astkeydir => /var/lib/asterisk
+      astdatadir => /var/lib/asterisk
+      astagidir => /var/lib/asterisk/agi-bin
+      astspooldir => /var/spool/asterisk
+      astrundir => /var/run/asterisk
+      astlogdir => /var/log/asterisk
+      astsbindir => ${pkgs.asterisk}/sbin
+    '';
+    extraConf = cfg.extraConfig;
+
+    # Loading all modules by default is considered sensible by the authors of
+    # "Asterisk: The Definitive Guide". Secure sites will likely want to
+    # specify their own "modules.conf" in the confFiles option.
+    modulesConf = ''
+      [modules]
+      autoload=yes
+    '';
+
+    # Use syslog for logging so logs can be viewed with journalctl
+    loggerConf = ''
+      [general]
+
+      [logfiles]
+      syslog.local0 => notice,warning,error
+    '';
+
+    buildCommand = ''
+      mkdir -p "$out"
+
+      # Create asterisk.conf, pointing astetcdir to the path of this derivation
+      echo "$asteriskConf" | sed "s|@out@|$out|g" > "$out"/asterisk.conf
+      echo "$extraConf" >> "$out"/asterisk.conf
+
+      echo "$modulesConf" > "$out"/modules.conf
+
+      echo "$loggerConf" > "$out"/logger.conf
+
+      # Config files specified in confFiles option override all other files
+      for i in $confFilesString; do
+        conf=$(echo "$i"_ | sed 's/\./_/g')
+        echo "''${!conf}" > "$out"/"$i"
+      done
+    '';
+  });
+in
+
+{
+  options = {
+    services.asterisk = {
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Whether to enable the Asterisk PBX server.
+        '';
+      };
+
+      extraConfig = mkOption {
+        default = "";
+        type = types.lines;
+        example = ''
+          [options]
+          verbose=3
+          debug=3
+        '';
+        description = ''
+          Extra configuration options appended to the default
+          <literal>asterisk.conf</literal> file.
+        '';
+      };
+
+      confFiles = mkOption {
+        default = {};
+        type = types.attrsOf types.str;
+        example = literalExample
+          ''
+            {
+              "extensions.conf" = '''
+                [tests]
+                ; Dial 100 for "hello, world"
+                exten => 100,1,Answer()
+                same  =>     n,Wait(1)
+                same  =>     n,Playback(hello-world)
+                same  =>     n,Hangup()
+
+                [softphones]
+                include => tests
+
+                [unauthorized]
+              ''';
+              "sip.conf" = '''
+                [general]
+                allowguest=no              ; Require authentication
+                context=unauthorized       ; Send unauthorized users to /dev/null
+                srvlookup=no               ; Don't do DNS lookup
+                udpbindaddr=0.0.0.0        ; Listen on all interfaces
+                nat=force_rport,comedia    ; Assume device is behind NAT
+
+                [softphone](!)
+                type=friend                ; Match on username first, IP second
+                context=softphones         ; Send to softphones context in
+                                           ; extensions.conf file
+                host=dynamic               ; Device will register with asterisk
+                disallow=all               ; Manually specify codecs to allow
+                allow=g722
+                allow=ulaw
+                allow=alaw
+
+                [myphone](softphone)
+                secret=GhoshevFew          ; Change this password!
+              ''';
+              "logger.conf" = '''
+                [general]
+
+                [logfiles]
+                ; Add debug output to log
+                syslog.local0 => notice,warning,error,debug
+              ''';
+            }
+        '';
+        description = ''
+          Sets the content of config files (typically ending with
+          <literal>.conf</literal>) in the Asterisk configuration directory.
+
+          Note that if you want to change <literal>asterisk.conf</literal>, it
+          is preferable to use the <option>services.asterisk.extraConfig</option>
+          option over this option. If <literal>"asterisk.conf"</literal> is
+          specified with the <option>confFiles</option> option (not recommended),
+          you must be prepared to set your own <literal>astetcdir</literal>
+          path.
+
+          See
+          <link xlink:href="http://www.asterisk.org/community/documentation"/>
+          for more examples of what is possible here.
+        '';
+      };
+
+      extraArguments = mkOption {
+        default = [];
+        type = types.listOf types.str;
+        example =
+          [ "-vvvddd" "-e" "1024" ];
+        description = ''
+          Additional command line arguments to pass to Asterisk.
+        '';
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    users.extraUsers = singleton
+    { name = asteriskUser;
+      uid = config.ids.uids.asterisk;
+      description = "Asterisk daemon user";
+      home = varlibdir;
+    };
+
+    systemd.services.asterisk = {
+      description = ''
+        Asterisk PBX server
+      '';
+
+      wantedBy = [ "multi-user.target" ];
+
+      preStart = ''
+        # Copy skeleton directory tree to /var
+        for d in '${varlibdir}' '${spooldir}' '${logdir}'; do
+          # TODO: Make exceptions for /var directories that likely should be updated
+          if [ ! -e "$d" ]; then
+            cp --recursive ${pkgs.asterisk}/"$d" "$d"
+            chown --recursive ${asteriskUser} "$d"
+            find "$d" -type d | xargs chmod 0755
+          fi
+        done
+      '';
+
+      serviceConfig = {
+        ExecStart =
+          let
+            # FIXME: This doesn't account for arguments with spaces
+            argString = concatStringsSep " " cfg.extraArguments;
+          in
+          "${pkgs.asterisk}/bin/asterisk -U ${asteriskUser} -C ${asteriskEtc}/asterisk.conf ${argString} -F";
+        Type = "forking";
+        PIDFile = "/var/run/asterisk/asterisk.pid";
+      };
+    };
+  };
+}