sip/transp: Allow ACK w/o Max-Forwards header (#1124)

baresip · May 21, 2024 · 24671f1 · 24671f1
1 parent 25b1e40
commit 24671f1
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/sip/transp.c b/src/sip/transp.c
@@ -314,7 +314,8 @@ static bool have_essential_fields(const struct sip_msg *msg)
 		pl_isset(&(msg->from.auri)) &&
 		pl_isset(&(msg->cseq.met)) &&
 		pl_isset(&(msg->callid)) &&
-		pl_isset(&(msg->maxfwd)) &&
+		(pl_isset(&(msg->maxfwd)) ||
+		 !pl_strncmp(&msg->met, "ACK", 3)) &&
 		pl_isset(&(msg->via.branch)))
 		return true;