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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Start off with a regular packet capture on the gateway to see if the problem is coming from the gateway side. If you hear it in that capture, you’ll need to
do a PCM capture to prove the problem to the carrier most likely- <a href="https://supportforums.cisco.com/docs/DOC-14060">
https://supportforums.cisco.com/docs/DOC-14060</a><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">Brian<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 style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span 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> Monday, October 21, 2013 10:19 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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