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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Packetization “transcoding” is a capability of an
MTP; so it’s conceivable.<o:p></o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>+Chris<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-bounces@puck.nether.net [mailto:cisco-voip-bounces@puck.nether.net] <b>On
Behalf Of </b>Mike Lydick<br>
<b>Sent:</b> Friday, June 04, 2010 10:02 AM<br>
<b>To:</b> cisco-voip@puck.nether.net<br>
<b>Subject:</b> Re: [cisco-voip] IOS Software MTP failure<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>After working with TAC as P2 and loosing about 4000 calls we
moved to Hardware MTP which lowered the call capacity significantly but
complete resolve the MTP bridging errors. TAC did find anything conclusive and
has opened a new bug on the IOS version we were running. <o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>Looking through the callmanager traces we found G711 calls
with different Packetization sizes (20/30). I am thinking this was causing the
MTP setup failures. <o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>We asked TAC about this after the hardware MTP were
installed and operating correctly. One TAC engineer said that the should
fail even with Hardware MTP unless we do some transcoding? We were not seeing
this. Some calls would coming as MTP and other as XCODE even though the Gateway
is set for MTP resources only. <o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'>Is it possible that the MTP is
transcoding for the packetization mismatch? <br>
<br>
<br>
<br>
<o:p></o:p></p>
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<p class=MsoNormal>On Thu, Jun 3, 2010 at 12:56 PM, Mike Lydick <<a
href="mailto:mike.lydick@gmail.com">mike.lydick@gmail.com</a>> wrote:<o:p></o:p></p>
<p class=MsoNormal>We are using a 3845 for software MTP for UCM to IP-GW calls.
We are getting 20-30 successful SCCP connections but we are seeing Open Logical
Channel failures and reports of drop calls. We are seeing the following error
from debug sccp all:<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>sym_xapp_calleg_bridge_failed bridge failed for sess_id 5095<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>Has anyone seen or resolved this error?<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><br clear=all>
Best Regards,<br>
<br>
Mike Lydick<br>
<br>
<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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