make sure frame is completely clean, before we send it to asterisk as DTMF. If we don't make it clean, it happens that one way audio occurs..

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@96199 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_misdn.c

@@ -4110,6 +4110,7 @@ cb_events(enum event_e event, struct misdn_bchannel *bc, void *user_data)
 			/*  sending INFOS as DTMF-Frames :) */
 			int digits;
 			struct ast_frame fr;
+			memset(&fr, 0, sizeof(fr));
 			fr.frametype = AST_FRAME_DTMF;
 			fr.subclass = bc->info_dad[0] ;
 			fr.src=NULL;