diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index bf236f853bdf28946ca01cdfe51ba08f6b93123c..5ad3affedff0b3939d72144000e1689731baaa9e 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -5582,7 +5582,9 @@ static int transmit_register(struct sip_registry *r, int sipmethod, char *auth,
 		ast_string_field_set(r, callid, p->callid);
 		if (r->portno)
 			p->sa.sin_port = htons(r->portno);
-		ast_set_flag(&p->flags[0], SIP_OUTGOING);	/* Registration is outgoing call */
+		else 	/* Set registry port to the port set from the peer definition/srv or default */
+			r->portno = p->sa.sin_port;
+		ast_set_flag(p, SIP_OUTGOING);	/* Registration is outgoing call */
 		r->call=p;			/* Save pointer to SIP packet */
 		p->registry = ASTOBJ_REF(r);	/* Add pointer to registry in packet */
 		if (!ast_strlen_zero(r->secret))	/* Secret (password) */