[cisco-voip] talking normally then way fast

[Chris Ward (chrward)]

Sounds like a router or VPN device somewhere is queueing some RTP. It
will take some investigation to figure out where its queueing though. I
would start with getting a full list of L3 hops from the VPN user's
computer to the phone you are testing with. And then start getting some
packet captures from both sides and see what they look like. They you
can start moving the captures inward in the topology and see which
device is doing it. If it turns out to be the Internets, then you might
be SOL. But there is a possibility you are missing some QOS somewhere
that is just causing it to queue the RTP. This is why RTP requires
express forwarding (EF) so that it doesn't get queued.

 

+Chris

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Scott Voll
Sent: Monday, August 23, 2010 5:02 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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