[75304] in North American Network Operators' Group
RE: How to Blocking VoIP ( H.323) ?
daemon@ATHENA.MIT.EDU (Scott Morris)
Thu Nov 11 07:32:25 2004
Reply-To: <swm@emanon.com>
From: "Scott Morris" <swm@emanon.com>
To: "'Joe Shen'" <joe_hznm@yahoo.com.sg>, "'NANGO'" <nanog@merit.edu>
Date: Thu, 11 Nov 2004 07:31:40 -0500
In-Reply-To: <20041111114029.70937.qmail@web53602.mail.yahoo.com>
Errors-To: owner-nanog-outgoing@merit.edu
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@emanon.com
-----Original Message-----
From: owner-nanog@merit.edu [mailto:owner-nanog@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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