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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Only reported on the 9971. No consistency to the issue.
<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">We’ve tried a selective firmware update to 9-2-2 without success.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">We have checked for possible delays in call setup with MGCP, Q.931 and SIP with no clues or even momentary delays in the setup.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">We have exhausted tweak options for the QSIG integration (timers, etc.)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">We have attempted to recreate the issue without success even with a phone known to experience the issue.<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">Unfortunately we don’t have the tools available to determine if we’re experiencing troubles with the RTP stream initialization, especially seeing as the issue
is intermittent.<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>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The one thing which stands out to me is that we have two other locations with the 9971 and they are not experiencing these issues. Only difference here is
the PBX integration with QSIG. This site is also the only one with PVDM3.<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""><o:p> </o:p></span></b></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">To:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Wellnitz, Erick A.<br>
<b>Cc:</b> cisco-voip@puck.nether.net<br>
<b>Subject:</b> Re: [cisco-voip] no audio for 10 seconds<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi Erick,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Based on history you're a pretty enterprising. Any insight on what you've checked so far?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Is it only reported on 9971's? Is there any other consistency in the reports thus far? <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">One of my favorite approaches to get a bit of insight on this type of issue is CMR data. Look at CMR's for "simple" calls - direct call, connection, duration hangup; no mute/transfer/hold/park/etc. If you're using fixed packet rate audio
codec (not ilbc) then the packets sent/received should be linearly proportional to call duration barring a few special situations.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Assuming 20packets per second are the number of packets received appropriate for the duration of the call? <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">If the packet counts are correct then it's an audio cut through issue on the gateway or audio rendering issue inside the phone.<o:p></o:p></p>
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<p class="MsoNormal">gateway concerns: call going into connected state, any progress indicators exchanged (affect audio cut through timing)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">If the packet counts are off then there is a network issue.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">/wes<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Nov 2, 2011, at 11:46 AM, Wellnitz, Erick A. wrote:<o:p></o:p></p>
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<p class="MsoNormal"><br>
<br>
<span class="apple-style-span"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif""><o:p></o:p></span></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">All, especially you really smart guys at Cisco…</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">We’re at a loss for where to continue looking for a potential cause on a very intermittent issue.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Mixed 9971 and 7975 environment with shared lines. Inbound calls come into our old (and temporary) Siemens PBX. Cross a QSIG trunk group to Cisco 3945 with PVDM3-192<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Caller on our Cisco side places a call. They hear ringback. Call connects without audio for about 10 seconds.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">We couldn’t find anything similar to this in bug toolkit. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">9971 firmware: 9-2-1<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">CUCM Ver: 8.0.3.21900<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">SR<span class="apple-converted-space"> </span></span><span style="font-size:9.0pt;font-family:"Arial","sans-serif"">619601919</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial","sans-serif""> </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial","sans-serif"">We have a laundry list of issues with the 9971 model but this is currently the most urgent.</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#333333">ERICK A. WELLNITZ<span class="apple-converted-space"> </span></span></b><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><br>
<span style="color:#333333">Network Engineer</span><br>
<b><span style="color:#83A6BD">Katten Muchin Rosenman LLP</span></b><br>
<span style="color:#333333">525 W. Monroe Street / Chicago, IL 60661-3693</span><br>
<span style="color:#333333">p / (312) 577-8041<span class="apple-converted-space"> </span></span><br>
</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><a href="mailto:erick.wellnitz@kattenlaw.com"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#333333">erick.wellnitz@kattenlaw.com</span></a></span><span class="apple-converted-space"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span></span><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">/<span class="apple-converted-space"> </span></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><a href="http://www.kattenlaw.com/"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#333333">www.kattenlaw.com</span></a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
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