How to Blocking VoIP ( H.323) ?

Thu Nov 11 13:28:31 UTC 2004

One might also suggest that explicit "denials", as
opposed to explicit "permits", as an access-control
policy is fundamentally flawed security approach in
the first place....

My $.02,

- ferg

-- "Scott Morris" <swm at emanon.com> wrote:

Tcp/1719 is part of the H323 Gatekeeper default ports (which can be changed)

Tcp/1720 is the H.225 call setup port, and I haven't heard of this being a configurable port.

-----Original Message-----
From: owner-nanog at merit.edu [mailto:owner-nanog at merit.edu] On Behalf Of Joe Shen
Sent: Thursday, November 11, 2004 6:40 AM
To: NANGO
Subject: How to Blocking VoIP ( H.323) ?

Hi,

How could it be done to block VoIP at access router?

I've thought about using ACL to block UDP port 1719,but this could be
overcome by modifying protocol port number. 

regards

Joe 

--
"Fergie", a.k.a. Paul Ferguson
 Engineering Architecture for the Internet
 fergdawg at netzero.net or
 fergdawg at sbcglobal.net