Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 395707)
+++ channels/chan_sip.c	(working copy)
@@ -8802,7 +8802,7 @@
 		}
 	}
 
-	ast_sockaddr_set_port(&p->sa, via->port ? via->port : STANDARD_SIP_PORT);
+	ast_sockaddr_parse(&p->sa, via->sent_by, 0);
 
 	free_via(via);
 	return 0;