Handle unknown 1xx reponses as 100 (bug #2698)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@4043 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -6823,6 +6823,11 @@ static void handle_response(struct sip_pvt *p, int resp, char *rest, struct sip_
 				p->alreadygone = 1;
 				if (!p->owner)
 					p->needdestroy = 1;
+			} else if ((resp >= 100) && (resp < 200)) {
+				/* Unknown 1xx repsonses should be treated as 100 */
+				if (!strcasecmp(msg, "INVITE")) {
+					sip_cancel_destroy(p);
+				}
 			} else
 				ast_log(LOG_NOTICE, "Dunno anything about a %d %s response from %s\n", resp, rest, p->owner ? p->owner->name : ast_inet_ntoa(iabuf, sizeof(iabuf), p->sa.sin_addr));
 		}