Mailing List Archive: Cisco: VOIP

Sounding like talking in a metal tube ?

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dpriebe at theriverbank

Nov 23, 2009, 8:40 AM

Post #1 of 3 (328 views)
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Sounding like talking in a metal tube ?

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.

Duane

craig at staffin

Nov 23, 2009, 10:33 AM

Post #2 of 3 (322 views)
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Re: Sounding like talking in a metal tube ? [In reply to]

check the PRI.

make sure there are no slips or errors on the line

On Mon, Nov 23, 2009 at 10:40 AM, Duane Priebe <dpriebe [at] theriverbank>wrote:

> 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.
>
>
>
> *Duane*
>
>
>
> _______________________________________________
> cisco-voip mailing list
> cisco-voip [at] puck
> https://puck.nether.net/mailman/listinfo/cisco-voip
>
>

David.Sullivan at barnet

Dec 1, 2009, 3:08 AM

Post #3 of 3 (280 views)
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Re: Sounding like talking in a metal tube ? [In reply to]

> 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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