diff --git a/pkgs/servers/asterisk/default.nix b/pkgs/servers/asterisk/default.nix
index ab309612788f..eb8560a98b35 100644
--- a/pkgs/servers/asterisk/default.nix
+++ b/pkgs/servers/asterisk/default.nix
@@ -1,8 +1,10 @@
-{ stdenv, lib, fetchurl, fetchsvn,
+{ stdenv, lib, fetchurl, fetchsvn, fetchFromGitHub,
   jansson, libedit, libxml2, libxslt, ncurses, openssl, sqlite,
   util-linux, dmidecode, libuuid, newt,
-  lua, speex,
-  srtp, wget, curl, iksemel, pkg-config
+  lua, speex, libopus, opusfile, libogg,
+  srtp, wget, curl, iksemel, pkg-config,
+  autoconf, libtool, automake,
+  withOpus ? true,
 }:
 
 let
@@ -13,8 +15,9 @@ let
     buildInputs = [ jansson libedit libxml2 libxslt ncurses openssl sqlite
                     dmidecode libuuid newt
                     lua speex
-                    srtp wget curl iksemel ];
-    nativeBuildInputs = [ util-linux pkg-config ];
+                    srtp wget curl iksemel ]
+                  ++ lib.optionals withOpus [ libopus opusfile libogg ];
+    nativeBuildInputs = [ util-linux pkg-config autoconf libtool automake ];
 
     patches = [
       # We want the Makefile to install the default /var skeleton
@@ -22,7 +25,7 @@ let
       # This patch changes the runtime behavior to look for state
       # directories in /var rather than ${out}/var.
       ./runtime-vardirs.patch
-    ];
+    ] ++ lib.optional withOpus "${asterisk-opus}/asterisk.patch";
 
     postPatch = ''
       echo "PJPROJECT_CONFIG_OPTS += --prefix=$out" >> third-party/pjproject/Makefile.rules
@@ -49,6 +52,12 @@ let
       ${lib.optionalString (externals ? "addons/mp3") "bash contrib/scripts/get_mp3_source.sh || true"}
 
       chmod -w externals_cache
+      ${lib.optionalString withOpus ''
+        cp ${asterisk-opus}/include/asterisk/* ./include/asterisk
+        cp ${asterisk-opus}/codecs/* ./codecs
+        cp ${asterisk-opus}/formats/* ./formats
+      ''}
+      ./bootstrap.sh
     '';
 
     configureFlags = [
@@ -63,6 +72,10 @@ let
       ${lib.optionalString (externals ? "addons/mp3") ''
         substituteInPlace menuselect.makeopts --replace 'format_mp3 ' ""
       ''}
+      ${lib.optionalString withOpus ''
+        substituteInPlace menuselect.makeopts --replace 'codec_opus_open_source ' ""
+        substituteInPlace menuselect.makeopts --replace 'format_ogg_opus_open_source ' ""
+      ''}
     '';
 
     postInstall = ''
@@ -90,6 +103,14 @@ let
     sha256 = "1s9idx2miwk178sa731ig9r4fzx4gy1q8xazfqyd7q4lfd70s1cy";
   };
 
+  asterisk-opus = fetchFromGitHub {
+    owner = "traud";
+    repo = "asterisk-opus";
+    # No releases, points to master as of 2022-04-06
+    rev = "a959f072d3f364be983dd27e6e250b038aaef747";
+    sha256 = "sha256-CASlTvTahOg9D5jccF/IN10LP/U8rRy9BFCSaHGQfCw=";
+  };
+
   # auto-generated by update.py
   versions = lib.mapAttrs (_: {version, sha256}: common {
     inherit version sha256;