Defer sending the connected line reinvite if a reinvite is already in progress.

(issue ASTERISK-19355)
Reported by: tomaso

(closes issue AST-825)
........

Merged revisions 358162 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@358163 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -13340,7 +13340,7 @@ static void update_connectedline(struct sip_pvt *p, const void *data, size_t dat
 	if (p->owner->_state == AST_STATE_UP || ast_test_flag(&p->flags[0], SIP_OUTGOING)) {
 		struct sip_request req;
 
-		if (p->invitestate == INV_CONFIRMED || p->invitestate == INV_TERMINATED) {
+		if (!p->pendinginvite && (p->invitestate == INV_CONFIRMED || p->invitestate == INV_TERMINATED)) {
 			reqprep(&req, p, ast_test_flag(&p->flags[0], SIP_REINVITE_UPDATE) ? SIP_UPDATE : SIP_INVITE, 0, 1);
 
 			add_header(&req, "Allow", ALLOWED_METHODS);