Index: asterisk-1.4.27-rc2/channels/chan_misdn.c
===================================================================
--- asterisk-1.4.27-rc2.orig/channels/chan_misdn.c	2009-10-21 20:17:27.000000000 +0200
+++ asterisk-1.4.27-rc2/channels/chan_misdn.c	2009-10-21 20:17:57.000000000 +0200
@@ -4912,6 +4912,7 @@
 		if (!misdn_cap_is_speech(ch->bc->capability)) {
 			struct ast_frame frame;
 			/*In Data Modes we queue frames*/
+			memset(&frame, 0, sizeof(frame));
 			frame.frametype  = AST_FRAME_VOICE; /*we have no data frames yet*/
 			frame.subclass = AST_FORMAT_ALAW;
 			frame.datalen = bc->bframe_len;