Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 149918)
+++ channels/chan_sip.c	(working copy)
@@ -7816,7 +7816,7 @@
 		seqno = p->ocseq;
 	}
 	
-	if (sipmethod == SIP_CANCEL) {
+	if (sipmethod == SIP_CANCEL || sipmethod == SIP_INVITE) {
 		p->branch = p->invite_branch;
 		build_via(p);
 	} else if (newbranch) {