[cisco-voip] Sounding like talking in a metal tube ?

[David Sullivan]

> Hello everyone.  Have an issue here, we have 9 voice gateways in our
> network and we are having complaints that incoming and outgoing calls
> (anything passing one particular LEC PSTN) sound like a "robot" or
> "talking in a metal tube" from customers.  This is happening only on
> one voice gateway at the moment.  I've tried restarting the gateway
and
> also doing a shut / no shut on the controller with no improvement.
All
> internal calls across our WAN are fine it's just calls transitioning
> this one particular voice gateway.   I'm running CM 4.1(3).  Any help
> and/or suggestions are appreciated, thanks in advance.

This sounds like a classic ulaw/alaw mismatch. Check the codec and dial
peer settings.

David Sullivan
IT Services Systems Team
Barnet College 
 
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