How to Blocking VoIP ( H.323) ?

Thu Nov 11 12:31:40 UTC 2004

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.

HTH,

Scott Morris, MCSE, CCDP, CCIE4 (R&S/ISP-Dial/Security/Service Provider)
#4713, JNCIP, CCNA-WAN Switching, CCSP, Cable Communications Specialist, IP
Telephony Support Specialist, IP Telephony Design Specialist, CISSP
CCSI #21903
swm at emanon.com

-----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 

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