diff --git a/.gitattributes b/.gitattributes
index 32845f7..bd72c2c 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,2 +1,3 @@
 **/secrets/** filter=git-crypt diff=git-crypt
 **/secrets.yaml diff=sops
+*.wav filter=lfs diff=lfs merge=lfs -text
diff --git a/hosts/aluminium/services/asterisk/README.md b/hosts/aluminium/services/asterisk/README.md
new file mode 100644
index 0000000..dc47981
--- /dev/null
+++ b/hosts/aluminium/services/asterisk/README.md
@@ -0,0 +1,9 @@
+## custom voicemail greetings
+
+Place `busy` and/or `unavail` file in users voicemail directory.
+
+The file can be converted to the fitting format using sox
+```bash
+sox $input_file -t wav -b 16 -c 1 -r 8k -e signed-integer --endian little unavail.wav
+```
+
diff --git a/hosts/aluminium/services/asterisk/default.nix b/hosts/aluminium/services/asterisk/default.nix
index 7080707..bc672dc 100644
--- a/hosts/aluminium/services/asterisk/default.nix
+++ b/hosts/aluminium/services/asterisk/default.nix
@@ -11,8 +11,23 @@ let
     start = builtins.elemAt ports.asterisk-rtp.udp.range 0;
     end = builtins.elemAt ports.asterisk-rtp.udp.range 1;
   };
-in
-{
+  voicemail-sounds = pkgs.callPackage ./voicemail-sounds { };
+in {
+  systemd.services.asterisk-voicemail-sounds = {
+    wantedBy = ["asterisk.service"];
+    after = ["asterisk.service"];
+    script = ''
+      ln -sfn \
+        ${voicemail-sounds}/unavail.wav \
+        /var/spool/asterisk/voicemail/lechner/876/unavail.wav
+    '';
+    restartTriggers = [voicemail-sounds];
+    serviceConfig = {
+      Type = "oneshot";
+      RemainAfterExit = true;
+    };
+  };
+
   services.asterisk = {
     enable = true;
     confFiles = {
@@ -30,7 +45,7 @@ in
         [sipgate-in]
         exten = _499846876,1,Noop(Processing an incoming call)
         same  = n,Dial(PJSIP/10&PJSIP/11,25,tT)
-        same  = n,VoiceMail(876@lechner,u)
+        same  = n,VoiceMail(876@lechner,uS)
         same  = n,Hangup()
 
         exten => _4998469779781,1,Verbose(3,Incoming fax)
@@ -155,7 +170,7 @@ in
 
   sops.secrets = (lib.listToAttrs (map
     (name: lib.nameValuePair "asterisk-${name}" {
-      sopsFile = ../secrets.yaml;
+      sopsFile = ../../secrets.yaml;
       owner = config.users.users.asterisk.name;
     })
     secretConfigFiles));
diff --git a/hosts/aluminium/services/asterisk/voicemail-sounds/default.nix b/hosts/aluminium/services/asterisk/voicemail-sounds/default.nix
new file mode 100644
index 0000000..a4a810c
--- /dev/null
+++ b/hosts/aluminium/services/asterisk/voicemail-sounds/default.nix
@@ -0,0 +1,13 @@
+{ lib, stdenvNoCC }:
+
+stdenvNoCC.mkDerivation {
+  name = "voicemail-sounds";
+
+  src = ./.;
+
+  dontBuild = true;
+  installPhase = ''
+    mkdir $out
+    cp -r * $out
+  '';
+}