Destroy sip channel when message is sent outside the context of a call...

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@4766 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -7918,6 +7918,8 @@ static int handle_request(struct sip_pvt *p, struct sip_request *req, struct soc
 			receive_message(p, req);
 		}
 		transmit_response(p, "200 OK", req);
+		if (!p->lastinvite)
+			ast_set_flag(p, SIP_NEEDDESTROY);
 	} else if (!strcasecmp(cmd, "SUBSCRIBE")) {
 		if (!ignore) {
 			/* Use this as the basis */