diff -Naur old/chan_sip.c new/chan_sip.c
--- old/chan_sip.c	2009-01-07 17:51:32.000000000 +0000
+++ new/chan_sip.c	2009-01-08 12:04:05.000000000 +0000
@@@ -9393,9 +9396,8 @@
 		if (!ast_strlen_zero(r->callback))
 			ast_string_field_set(p, exten, r->callback);
 
-		/* Set transport and port so the correct contact is built */
+		/* Set transport so the correct contact is built */
 		p->socket.type = r->transport;
-		p->socket.port = htons(r->portno);
 		/*
 		  check which address we should use in our contact header
 		  based on whether the remote host is on the external or