From: Ramasubramanian Sethuraman (snrmanian@hotmail.com)
Date: Thu Mar 11 2004 - 01:46:51 GMT-3
Hi,
Voice signalling is done using tcp port number 1720 and it
can be either in source (or) destination port field of tcp header.
Hence i think you need to modify the ACL as shown below.
ip access-list extended VOICE
permit udp any any range 16384 32767
permit tcp any any eq 1720
permit tcp any eq 1720 any
!
the following is a good link for classifying voice and also
how to define FRTS to voice traffic.
http://www.cisco.com/warp/public/788/voice-qos/voip-ov-fr-qos.html#topic8
thanks,
subbu
>From: <alsontra@hotmail.com>
>Reply-To: <alsontra@hotmail.com>
>To: <ccielab@groupstudy.com>
>Subject: VOICE Classification - Class-maps
>Date: Wed, 10 Mar 2004 21:08:02 -0800
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>Group,
>
>This question has been asked before, but there was no answer. Forgive my
>repetition...
>
>
>If you need to classify voice and all that goes with it (H323, etc), can
>you
>assume that ports 1720 and 16384 - 32767 will encompass voice traffic? In
>general, I'm finding that most voice traffic traverse these udp ports.
>
>For example:
>
>If you asked to classify and set DSCP values on all voip traffic, would
>something of this sort do the trick?
>
>ip access-list extended VOICE
> permit udp any any range 16384 32767
> permit udp any any eq 1720
>
> class-map match-all VoIP
> match access-group name VOICE
>
>
> policy-map QOS
> class VoIP
> set dscp cs5
> class class-default
> set dscp cs1
>
>int e0/0
>service-policy input QOS
>
>
>While this is certainly not all inclusive, it essentially cover most voip
>activities correct? Or do you have to try and use the question to find the
>appropriate port numbers?
>
>Thanks,
>Alsontra
>
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