From: Chris Lewis \(chrlewis\) (chrlewis@cisco.com)
Date: Fri Aug 19 2005 - 14:22:56 GMT-3
RTP has payload and control packets (referred to as RTCP), H.323 is
completely separate.
RTP for voice uses the range 16384 to 32767
RTP for video uses 49152 to 65535
There is a significant difference between the two methods you describe.
The NBAR RTP Payload Classification feature does not identify RTCP
packets, whereas the ACL will, as it matches on both even and odd
numbered ports within the range. RTCP packets run on odd-numbered ports
while RTP packets run on even-numbered ports.
Chris
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
ccie2be
Sent: Thursday, August 18, 2005 7:40 AM
To: Group Study
Subject: match protocol rtp audio
Hi guys,
Can someone confirm this:
access-list 100 permit udp any any range 16384 32767 = match prot rtp
audio
And, match prot rtp audio doesn't include the control H323 signaling
(tcp any any eq 1720).
The Doc-CD is about as clear as mud on this:
<quote>
audio: Specifies matching by audio payload-type values in the range of 0
to 23. These payload-type values are reserved for audio traffic.
<endquote>
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/
qos_
r/qos_m1g.htm#wp1112916
TIA, Tim
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