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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">-mn<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> cisco-voip [mailto:cisco-voip-bounces@puck.nether.net]
<b>On Behalf Of </b>costas georgiou<br>
<b>Sent:</b> October-21-13 8:19 AM<br>
<b>To:</b> cisco-voip@puck.nether.net<br>
<b>Subject:</b> [cisco-voip] Cracking noise during calls<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">Hi guys,<br>
<br>
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.<br>
<br>
Any ideas?<br>
<br>
Thanks and Regards<o:p></o:p></span></p>
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