From: West, Jeff (westj@telecomsys.com)
Date: Thu Feb 27 2003 - 09:08:48 GMT-3
A IP phone sends voice @ 5 and control (DTMF) @ 4, and in a voip dial
peer you should always specify the precedence of 5. I use access-lists
to match precedence of 4 and 5 all the time and it works great.
Jeff West
TeleCommunication Systems, Inc.
westj@telecomsys.com
www.telecomsys.com
-----Original Message-----
From: Sam.MicroGate@usa.telekom.de
[mailto:Sam.MicroGate@usa.telekom.de]
Sent: Wednesday, February 26, 2003 3:34 PM
To: umair@cisco.com; ccielab@groupstudy.com
Subject: RE: Matching IP Precedence in VoIP ACLs
Not all voice traffic carries a precedence of 5. Therefore, the first
access control list is a better choice.
Sam
-----Original Message-----
From: Umair Hoodbhoy [mailto:umair@cisco.com]
Sent: Sunday, February 23, 2003 7:14 PM
To: ccielab@groupstudy.com
Subject: Matching IP Precedence in VoIP ACLs
Hier,
Searching through the archives of this group and various docs I've
always come across this ACL for matching VoIP traffic:
access-list 101 permit udp any any range 16384 32767
My question is why don't people use this instead:
access-list 101 permit udp any any range 16384 32767 precedence
critical ?
IP Precedence 5 is 'critical' and my understanding is that VoIP
appliances like IP Phones transmit IP with that precedence. Is this a
fair question to ask a proctor or should we know this before walking
into the exam?
TIA,
-- Umair
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