From: Jim White (jim.t.white@gmail.com)
Date: Mon Nov 06 2006 - 15:06:11 ART
John,
For Voice QoS You should match both the Voice Payload (RTP) and also
the signalling (H323, Skinny, SIP, MGCP).
Rather than writing an ACL that allows UDP Ports 16384 to 32676 through
in your ACL (Whos to say its only RTP will use them ports) you could use
Cisco NBAR to identify the voice payload (e.g. match protocol rtp), this
way theres a bit more intelligence involved.
Jim
John Aitken wrote:
> Guys,
>
> Wondering if someone could enlighten me on which match statement to use to
> match voice traffic:
>
> >From what I can see you can match RTP payload only
>
> match protocol ip rtp 16384 16383
> match protocol rtp audio
>
> I'm not really clear what the difference is between these two, if there is
> one?
>
> Then all VOIP with an ACL
>
> match access-group 100
> access-list 100 permit udp any any range 16384 32767
> access-list 100 permit tcp any any eq 1720
>
>
> Just wondering if anyone can enlighten me as when it's appropriate to use
> what; is it best to use the ACL unless the question specifically mentions
> even numbered ports or voice payload etc or if the question just states
> voice would any method be acceptable?
>
> Cheers,
>
> John
>
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