properly ignore retransmitted INVITEs on long latency links (issue #3658)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6660 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -10032,7 +10032,7 @@ static int handle_request_invite(struct sip_pvt *p, struct sip_request *req, int
 			transmit_response(p, "100 Trying", req);
 		}
 	} else {
-		if (p && !ast_test_flag(p, SIP_NEEDDESTROY)) {
+		if (p && !ast_test_flag(p, SIP_NEEDDESTROY) && !ignore) {
 			if (!p->jointcapability) {
 				if (ignore)
 					transmit_response(p, "488 Not Acceptable Here (codec error)", req);