diff -NaurbB old/chan_sip.c new/chan_sip.c
--- old/chan_sip.c	2008-09-06 21:21:51.000000000 +0100
+++ new/chan_sip.c	2009-01-09 13:54:25.000000000 +0000
@@ -9396,9 +9396,6 @@
 	/* Fromdomain is what we are registering to, regardless of actual
 	   host name from SRV */
 	if (!ast_strlen_zero(p->fromdomain)) {
-		if (r->portno && r->portno != STANDARD_SIP_PORT)
-			snprintf(addr, sizeof(addr), "sip:%s:%d", p->fromdomain, r->portno);
-		else
 			snprintf(addr, sizeof(addr), "sip:%s", p->fromdomain);
 	} else {
 		if (r->portno && r->portno != STANDARD_SIP_PORT)