[cisco-voip] Call going in and out

[Ryan Ratliff]

Look at your voip dial-peers.  If they have the command 'no vad' set  
then good.  If not then vad is enabled and you will want to put that  
command on all of them.

VAD = Voice Activity Detection

Basically if the endpoint detects silence it stops sending packets.   
Supposed to be a bandwidth saving mechanism but usually cause more  
problems than it solves.

-Ryan

On Apr 2, 2007, at 1:40 PM, Kathy Dupree wrote:

Thanks Ryan.  Silence suppression is set to False.  The gateway is H.323
but I don't know what VAD is.  sorry

Katherine O. Dupree
Randolph-Macon Woman's College
Main 243
Telecommunications Support/Infrastructure Coordinator
kdupree at rmwc.edu
(434) 947 8371


-----Original Message-----
From: Ryan Ratliff [mailto:rratliff at cisco.com]
Sent: Monday, April 02, 2007 1:22 PM
To: Kathy Dupree
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Call going in and out

What they had you do was upgrade the DSPWare on the router.  I'd
recommend letting the TAC CSE know the new DSPWare did not resolve
the issue.

When you are losing audio like that either you aren't getting the RTP
packets or you are getting them but silence is being inserted.  If
you are using g.729 make sure you don't have 729b enabled as it has
VAD built-in and you cannot disable it.

If the issue happens talking to PSTN callers then make sure the CM
service parameter "silence suppression..." is disabled.  This should
be the default.  If using an H.323 gateway make sure all of your voip
dial-peers have vad disabled.

If you are not losing any packets at the phone then the only thing I
can think of that will insert silence is VAD.  If that's disabled
then it's probably a bug, hence the new DSPWare.

-Ryan

On Apr 2, 2007, at 1:14 PM, Kathy Dupree wrote:

It seems I have some odd problems but here is another one.  This one
I have contacted TAC and their solution didn't work so I was checking
with you guys to see if anyone else had experienced this.  When on a
call you will be listening to the other person and it will go out for
a couple of seconds and then come back.  This happens continuously
while on the call.  I have had to ask people to repeat what they said
because I missed it.



TAC had us download a file to the router and then reboot.  We did
that yesterday and today the issue is still happening.   Thanks







Katherine O. Dupree

Randolph-Macon Woman's College

Main 243

Telecommunications Support/Infrastructure Coordinator

kdupree at rmwc.edu

(434) 947 8371



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