[cisco-voip] Voice Conversation PPS

[Andrew Dignan]

I didn't think to check the RTP headers, thanks.  I did play back the
tcpdump with VOMIT and the conversation was fine, so I don't think it was
"double dipping" but something obviously has to be going on.

Andy

> Andy,
>
> are you sure that you don't look at the same packets more than once.
> Depending on how you have set up the port mirroring there is a possibility
> to see packets more than once in a trace. I'd go for the sequence numbers
> in the RTP header to verify. I cannot imagine a codec to produce more than
> the normal 33 to 55 pps so I assume that what you see might be a recording
> issue or a switch misconfiguration (although...if YOU write this post i
> doubt very much that the switch is misconfigured.)
>
> HTH
> mat
> -----------------------------------------------------------------------------------
> Matthias Schaerer
> Network Engineer, Instructor
> Mob: +41 79 419 4557
>
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>
> "Andrew Dignan" <andy at dignans.com>
> Sent by: cisco-voip-bounces at puck.nether.net
> 09.02.2005 21:39
> Please respond to andy
>
>
>         To:     cisco-voip at puck.nether.net
>         cc:
>         Subject:        [cisco-voip] Voice Conversation PPS
>
>
> Troubleshooting a Witness call recording quality issue.  I am looking at
> an ethereal trace and I am looking at a particular voice conversation
> between 2 IP phones, in 20 seconds 2973 packets were Tx and 6937 were Rx,
> that's 149 and 345 pps respectively, how is this possible with g711 20 ms
> sample size, I should only see 50 pps plus 150 bps of Skinny.  If I look
> at the individual packets the arrival time between packets is on average 2
> to 10 Microseconds  instead of 20 ms.  Am I missing something?
>
> Andy - berbee
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