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<div dir="ltr"><font face="Tahoma" color="#000000" size="2">PCM dump and Wireshark will be your fiends. You gotta find where the problem is being introduced.</font></div>
<div dir="ltr"><font face="tahoma" size="2"></font> </div>
<div dir="ltr"><font face="tahoma" size="2">You can also rent a TTC T-Berd with a Y-Cable for a month from someone online (eg TRS-RenTelco). This would allow monitoring the PRIs like your the telco, or see if the Telco would loan/leave a T-Berd for you to
use.</font></div>
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<font face="Tahoma" size="2"><b>From:</b> cisco-voip-bounces@puck.nether.net [cisco-voip-bounces@puck.nether.net] On Behalf Of Go0se [me@go0se.com]<br>
<b>Sent:</b> Thursday, April 29, 2010 11:51 AM<br>
<b>To:</b> cisco-voip@puck.nether.net<br>
<b>Subject:</b> [cisco-voip] strange call issue<br>
</font><br>
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<p class="MsoNormal">We have a customer with CM6 that has a 3725 with 3 PRIs to the same telco. The cisco users are complaining of issues, such as a “loud squeal” and then the call drops or also a “robotic sound” and then the call drops. Apparently the PSTN
caller can hear nothing at all. They average about a dozen (+/-) per day. The T1 controllers are ALWAYS clean, no errors, no slip seconds, etc. QoS appears correct. The strange part is this: tracking the issue with the QRT tool the issue always seems to tie
to the same PRI – until we reboot or change something. Originally the issue was on controller 1/1 – for several days the QRT issues were ALWAYS on the same controller. We upgraded the IOS and rebooted and it moved to controller 1/2. Thinking it was possibly
a DSP issue TAC shipped out replacement DSPs. We replaced the DSPs and the issue remained on 1/2. We put controller 1/2 in “shutdown” state and the issue moved back to controller 1/1. TAC asked us to do a PCM dump but we made test calls for around an hour
and a half – and had one bad test call, but the call dropped before we could run the dump.
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<p class="MsoNormal">This has been going on for months and we are no closer than when we started. Any input would be appreciated.</p>
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<p class="MsoNormal">Thanks,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Go0se</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">My blog: </p>
<p class="MsoNormal"><a href="http://atc.go0se.com/" target="_blank"><span style="COLOR: blue">http://atc.go0se.com</span></a></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">-------------------------------------</p>
<p class="MsoNormal">Help Hopegivers International </p>
<p class="MsoNormal">feed the orphans of India.</p>
<p class="MsoNormal"><a href="http://www.hopegivers.org/" target="_blank"><span style="COLOR: blue">http://www.hopegivers.org</span></a></p>
<p class="MsoNormal">-------------------------------------</p>
<p class="MsoNormal"> </p>
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