siprec: unref failed dialogs

Close #2674

modules/siprec/siprec_logic.c

@@ -625,15 +625,20 @@ void tm_start_recording(struct cell *t, int type, struct tmcb_params *ps)
 	str *body;
 	struct src_sess *ss;
 
-	if (!is_invite(t) || ps->code >= 300)
+	if (!is_invite(t))
 		return;
+	ss = (struct src_sess *)*ps->param;
+	if (ps->code >= 300) {
+		/* unref so we can release the dialog */
+		srec_dlg.dlg_unref(ss->dlg, 1);
+		return;
+	}
 
 	/* check if we have a reply with body */
 	body = get_body_part(ps->rpl, TYPE_APPLICATION, SUBTYPE_SDP);
 	if (!body || body->len == 0)
 		return;
 
-	ss = (struct src_sess *)*ps->param;
 	/* engage only on successful calls */
 	SIPREC_LOCK(ss);
 	/* if session has been started, do not start it again */