diff --git a/src/sip/transp.c b/src/sip/transp.c
index c63940a8b..ada515522 100644
--- a/src/sip/transp.c
+++ b/src/sip/transp.c
@@ -794,9 +794,13 @@ static int conn_send(struct sip_connqent **qentp, struct sip *sip, bool secure,
 
 	/* Fallback check for any address win32 */
 	if (!sa_isset(&conn->laddr, SA_ALL)) {
+		uint16_t port = sa_port(&conn->laddr);
 		err = sip_transp_laddr(sip, &conn->laddr, conn->tp, dst);
 		if (err)
 			goto out;
+
+		if (port)
+			sa_set_port(&conn->laddr, port);
 	}
 
 	if (connh) {