--- asterisk-1.8.15.0.o/channels/chan_local.c	2012-05-04 18:24:34.000000000 +0200
+++ asterisk-1.8.15.0/channels/chan_local.c	2012-09-22 22:48:29.360241634 +0200
@@ -1127,7 +1155,7 @@
 
 	ast_copy_string(tmp->context, c ? c : "default", sizeof(tmp->context));
 
-	tmp->reqformat = format;
+	tmp->reqformat = AST_FORMAT_G729A;
 
 #if 0
 	/* We can't do this check here, because we don't know the CallerID yet, and