Re: VOICE Classification - Class-maps

From: alsontra@hotmail.com
Date: Thu Mar 11 2004 - 08:22:35 GMT-3

Thanks for the responses. For the RS exam, I'm hoping this is it as far as
voice port numbers go...

Cisco H.323 uses TCP port 1720
Cisco VoIP payload uses UDP ports 16835 - 32767
Cisco Gatekeeper uses TCP port 1719
SIP uses UDP port 5060
RTP can be identified by the RTP header
MGCP port - 1025 through 65535 (not sure how important this is)
SCCP (not sure)

I can't seem to find all of these port numbers within the docCD, so guess
memorization is probably the best method of recall. If anyone has any
comments as to other relevant voice port numbers I would appreciate your
comments.

H.323 TCP 1720
VoIP payload UDP 16835 - 32767
Cisco Gatekeeper TCP 1719
SIP UDP 5060
RTP RTP header
MGCP 1025 through 65535 (not sure how important this
is)
SCCP (not sure)

Thanks,
Alsontra

----- Original Message -----
From: "Joe Martin" <joe@martinsweb.org>
To: "'Yasser Abdullah '" <yasser@alharbitelecom.com>;
<alsontra@hotmail.com>; <ccielab@groupstudy.com>
Sent: Wednesday, March 10, 2004 10:29 PM
Subject: RE: VOICE Classification - Class-maps

Also, VoIP comes in protocols other than H.323. It could be SIP, MGCP or
SCCP which all have different port for call control. Though all of them use
the same UDP port range for RTP traffic.

Joe

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Yasser Abdullah
Sent: Wednesday, March 10, 2004 9:30 PM
To: alsontra@hotmail.com; ccielab@groupstudy.com
Subject: RE: VOICE Classification - Class-maps

Also, if your voice gateways register with a gatekeeper, you'll need TCP
port 1719.

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
alsontra@hotmail.com
Sent: Thursday, March 11, 2004 8:08 AM
To: ccielab@groupstudy.com
Subject: VOICE Classification - Class-maps

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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