[cisco-voip] Cracking noise during calls

[Norton, Mike]

I'd start with looking on the gateway for ISDN errors. "Show controllers t1" (or e1, depending on your country). If you are getting errors there, make sure your gateway is configured to use the carrier as its clock source.

-mn


From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of costas georgiou
Sent: October-21-13 8:19 AM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Cracking noise during calls

Hi guys,

I have an issue on one of my sites, where someone makes an outgoing call through the ISDN, they hear a crackling sound on the phone.  This is only happening to three phones out of 15.   The person on the other end cannot hear this, only the person who is making the call from the IP phone.  The provider apparently has checked the ISDN and all seems fine, the gateway has been completely replaced and also moved closer to the ISDN circuit.  We have swapped over a phone that we think did not have the issue, but it is still there.

Any ideas?

Thanks and Regards
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