diff --git a/modules/clan/asterisk/default.nix b/modules/clan/asterisk/default.nix
index 4689383..37aa8c9 100644
--- a/modules/clan/asterisk/default.nix
+++ b/modules/clan/asterisk/default.nix
@@ -64,8 +64,12 @@
               context=from-internal
               disallow=all
               allow=ulaw
+              allow=alaw
+              allow=g722
+              allow=gsm
               auth=6001
               aors=6001
+              direct_media=no
 
               [6001]
               type=auth
@@ -82,8 +86,12 @@
               context=from-internal
               disallow=all
               allow=ulaw
+              allow=alaw
+              allow=g722
+              allow=gsm
               auth=6002
               aors=6002
+              direct_media=no
 
               [6002]
               type=auth