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<p class="MsoNormal" style="BACKGROUND: white; MARGIN: 0in 0in 0pt"><span style="FONT-FAMILY: Arial">Some points to note.</span></p>
<p class="MsoNormal" style="BACKGROUND: white; MARGIN: 0in 0in 0pt"><span style="FONT-FAMILY: Arial">You're really not experiencing a 1 way audio issue. 1 way audio is typically when the return audio stream is lost in one direction entirely via a routing issue or similar and you have no audio (dead air) in one direction. You are however running in a voice quality issue that can be a pain in the ass to track down. I've run into very similar issues a few times in the past and it has always turned out to be one of 3 issues. I'll assume that these are all external calls to or from the PSTN that are being affected, I can't invision this occurring on an internal call unless this audio stream was hitting a WAN or VPN link in which case it could be a QOS issue (or lack of QOS).
</span></p>
<p class="MsoNormal" style="BACKGROUND: white; MARGIN: 0in 0in 0pt"><span style="FONT-FAMILY: Arial"> </span></p>
<p class="MsoNormal" style="BACKGROUND: white; MARGIN: 0in 0in 0pt"><span style="FONT-FAMILY: Arial">1: Bad DSPs on the Voice gateway which explains the intermittent problem if its only one or a part of a DSP that's bad and is only hit intermittently
</span></p>
<p class="MsoNormal" style="BACKGROUND: white; MARGIN: 0in 0in 0pt"><span style="FONT-FAMILY: Arial">2: Buggy code on the IOS gateway, there were some really ugly DSP type bugs in previous code that could be causing this.
</span></p>
<p class="MsoNormal" style="BACKGROUND: white; MARGIN: 0in 0in 0pt"><span style="FONT-FAMILY: Arial">3: PRI issue/provider issue, low signal or similar on the PRI</span></p>
<p class="MsoNormal" style="BACKGROUND: white; MARGIN: 0in 0in 0pt"><span style="FONT-FAMILY: Arial"> </span></p>
<p class="MsoNormal" style="BACKGROUND: white; MARGIN: 0in 0in 0pt"><span style="FONT-FAMILY: Arial">Out of the 3 I'd be leaning towards bad DSPs but any of the 3 will likely require a TAC case.</span></p></div>
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<div><span class="gmail_quote">On 9/11/07, <b class="gmail_sendername">Weigand, John V.</b> <<a href="mailto:jvw@medicineforthedefense.com">jvw@medicineforthedefense.com</a>> wrote:</span>
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<p>Our CCM5.x system was installed by our vendor back in February. Since then, we've had an ongoing one way voice issue. Every so often (mostly reported by our phone receptionists, but by a few other key users), they'll either receive or make a call, and be nearly unable to hear the person on the other end. They can just barely make out their voice, and adjusting the phone volume does nothing. The person on the other end is able to hear them with no issue.
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<p>We've tried swapping the phones, etc, with no luck. I've had no formal Callmanager or even VOIP training, but I've been able to pick up a lot, and administration of the system has fallen to me. I found this <a onclick="return top.js.OpenExtLink(window,event,this)" href="http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a008009484b.shtml" target="_blank">
document</a> about troubleshooting voice issues, and (based on my very limited knowledge), I'm wondering if it has something to do with Media Termination Points. Based on what I've read, there's a difference between configuring those on CCM4 and CCM5, and our vendor really knew nothing about CCM5, and set it up as if it was CCM4.
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<p>Can anyone give me some guidance on how I can learn more about this/figure it out/any other possible ideas what could be causing it?</p>
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<p>Thanks so much!</p></div><br></font>
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<td valign="top" width="45%"><font face="Verdana" size="2"><font color="navy"><strong>John V. Weigand</strong><br></font><font color="black" size="1"><font color="navy">Help Desk Support<br></font><br>Litigation Management Inc.
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