Index: chan_sip.c
===================================================================
RCS file: /usr/cvsroot/asterisk/channels/chan_sip.c,v
retrieving revision 1.263
diff -u -r1.263 chan_sip.c
--- chan_sip.c	13 Dec 2003 22:54:37 -0000	1.263
+++ chan_sip.c	15 Dec 2003 22:12:32 -0000
@@ -2694,8 +2694,11 @@
 	struct sip_request req;
 	if (p->canreinvite == REINVITE_UPDATE)
 		reqprep(&req, p, "UPDATE", 0);
-	else
+	else {
+		p->branch++;
+		snprintf(p->via, sizeof(p->via), "SIP/2.0/UDP %s:%d;branch=z9hG4bK%08x", inet_ntoa(p->ourip), ourport, p->branch);
 		reqprep(&req, p, "INVITE", 0);
+	}
 	add_header(&req, "Allow", ALLOWED_METHODS);
 	add_sdp(&req, p, rtp, vrtp);
 	/* Use this as the basis */