--- gstringbuffer.c.orig	2006-02-03 15:45:06.000000000 +0200
+++ gstringbuffer.c	2006-02-03 15:49:16.000000000 +0200
@@ -309,6 +309,11 @@
     spec->format = GST_MU_LAW;
     spec->width = 8;
     spec->depth = 8;
+  } else if (!strncmp (mimetype, "audio/iLBC", 12)) {
+    spec->type = GST_BUFTYPE_ILBC;
+    spec->format = GST_ILBC;
+    spec->width = 16;
+    spec->depth = 16;
   } else {
     goto parse_error;
   }
