TT#14008 fix segfault using legacy UDP protocol

closes #1437

Change-Id: I23fd44db91ce8a1d1934e2be0c1434eee35cefc1

daemon/call.c

@@ -2790,7 +2790,7 @@ int monologue_offer_answer(struct call_monologue *dialogue[2], GQueue *streams,
 			goto error_ports;
 		}
 
-		if(flags->disable_jb && media->call)
+		if (flags && flags->disable_jb && media->call)
 			media->call->disable_jb=1;
 
 		__num_media_streams(media, num_ports_this);