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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Could you attach the router configuration? <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>Dave Wolgast<br>
<b>Sent:</b> Tuesday, March 04, 2008 12:18 PM<br>
<b>To:</b> Cisco VOIP Newsletter - puck.nether.net<br>
<b>Subject:</b> [cisco-voip] Why is a transcoder getting involved?<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>I have a semi-complex call flow which at some point, is
invoking a transcoding resource. The problem is, I am not expecting to
need a transcoder in this situation, and it's exhausting my transcoder pool for
calls that actually need them.<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>Call flow involves a 3rd-party H.323 IVR behind an IP-IP-GW
configured as an H.323 GW with MTP in CUCM 4.1(3). This was
necessary because the IVR's only useful transfer method is H.450.2, and we were
able to use the IPIPGW to convert that to something that CUCM could deal with.<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>PSTN --> MGCP PRI (3845 ISR) --> IP-IP-GW/hairpin
(H323-to-H323) --> IVR --> IP-IP-GW --> IP Phone (SCCP)<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>I believe that all legs of this call are configured for
g.711ulaw, including all dial-peers on the IPIPGW, which is why I don't know
why the transcoder is getting invoked.<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>The one thing I noticed, when looking at what the transcode
resources were doing, was the following:<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>#show sccp connections detailed<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>sess_id
conn_id call-id
codec pkt-period
type
bridge-info(bid, cid) mmbridge-info(bid, cid)<o:p></o:p></p>
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<p class=MsoNormal>117552198
-
352499 N/A
N/A
transmsp All RTPSPI Calllegs N/A<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>117552198 126766065 352500
g711u
20
rtpspi
(255454,352499) N/A<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>117552198 126766049 352498
g711u
20
rtpspi
(255453,352499) N/A<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<div>
<p class=MsoNormal>-----------------------------<o:p></o:p></p>
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<p class=MsoNormal>Not sure if this is relevant or not.<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 anyone has any insight as to where the transcoder is
creeping in, or can give me a clue how to track it down better, I will
appreciate it very much.<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>Thanks!!!<br>
-- <br>
Dave Wolgast<br>
Livonia, NY <o:p></o:p></p>
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