[cisco-voip] talking normally then way fast

[Nick Matthews]

Sound card theory sounds pretty convincing.  Most of the voice software has
rules about dropping packets it received it can't use, so the problem in
theory should be isolated to the endpoints.  If you do a 'show call active
voice brief' it has a field for lost/early/late packets.  The late and early
packets indicated packets that were not usable because they came at the
wrong time.  I've never heard of anything like this on a cisco hard phone.
If it is a hard phone, I would try other firmware versions.  The QOS theory
holds water, but I just don't visualize something playing it back
incorrectly.  I've seen this doing DSP captures, but that's a pretty
different game.

-nick

On Mon, Aug 23, 2010 at 5:16 PM, Norton, Mike <mikenorton at pwsd76.ab.ca>wrote:

>  In my non-work life I pretend to do some audio stuff, and I have seen
> symptoms like that when the soundcard can’t decide what sample rate it’s
> supposed to run at. For example, if the driver wants to force to the
> hardware to a particular sample rate, but a device connected to the optical
> input is providing clocking at a different rate. Or if multiple applications
> are trying to control the sample rate instead of letting the driver convert
> their signals to something common.
>
>
>
> I would try to confirm whether it is a soundcard issue or a network traffic
> issue before wandering too deeply down either troubleshooting path.
>
>
>
> --
>
> Mike Norton
>
> I.T. Support
>
> Peace Wapiti School Division No. 76
>
> Helpdesk: 780-831-3080
>
> Direct: 780-831-3076
>
>
>
>
>
>
>
> *From:* cisco-voip-bounces at puck.nether.net [mailto:
> cisco-voip-bounces at puck.nether.net] *On Behalf Of *Scott Voll
> *Sent:* August-23-10 3:02 PM
>
> *To:* cisco-voip at puck.nether.net
> *Subject:* [cisco-voip] talking normally then way fast
>
>
>
> This has got us stumped.
>
>
>
> CM 4.2 and Softphone user from home over VPN.
>
>
>
> User calls because she is having soft phone issues.  Leave us a VM.  for
> about 25 seconds the vm is normal speed.  Then the last few seconds are
> condensed into 1 sec.
>
>
>
> Call her back.  Real time audio has some of the same issues.  Talking fine,
> then dead air and then a super fast talk.
>
>
>
> Seems like maybe there is some kind of software on her box that is storing
> and forwarding packets.  Anyone else ever see this?
>
>
>
> I would be happy to forward off line to hear it.  We are idealess.
>
>
>
> Thanks
>
>
>
> Scott
>
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