VOICE Classification - Class-maps posted 03/11/2004
- Subject: VOICE Classification - Class-maps
- From: <alsontra@xxxxxxxxxxx>
- Date: Wed, 10 Mar 2004 21:08:02 -0800
This question has been asked before, but there was no answer. Forgive my
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.
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
set dscp cs5
set dscp cs1
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?