connect: do not enforce Contact header in 1XX responses with To tag

There are some SIP UAs which send 1XX responses with a To tag and without a Contact header.
baresip · Dec 12, 2023 · d1027d0 · d1027d0
1 parent d258bf6
commit d1027d0
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/sipsess/connect.c b/src/sipsess/connect.c
@@ -103,7 +103,8 @@ static void invite_resp_handler(int err, const struct sip_msg *msg, void *arg)
 				goto out;
 		}
 
-		if (pl_isset(&msg->to.tag)) {
+		contact = sip_msg_hdr(msg, SIP_HDR_CONTACT);
+		if (pl_isset(&msg->to.tag) && contact) {
 			err = sip_dialog_established(sess->dlg) ?
 					sip_dialog_update(sess->dlg, msg) :
 					sip_dialog_create(sess->dlg, msg);