Fix issue #7928 correctly. Next is a comment of previous fix:

Issue #7928 - Don't send both 404 and 503. Fix by phsultan with
a small fix by me, myself or I. Thanks, Philippe!
(This was caused by my changes to the transaction handling)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@44078 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -13174,7 +13174,7 @@ static int handle_request_invite(struct sip_pvt *p, struct sip_request *req, int
 			break;
 		}
 	} else {
-		if (p && p->autokillid > -1) {
+		if (p && (p->autokillid == -1)) {
 			const char *msg;
 
 			if (!p->jointcapability)