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<p class=MsoNormal><span style='color:#1F497D'>Hi Wes <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Thank you very much for your
reply. Answers to your questions:<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Clipping –
losing the first 2 seconds from the receiver like their hello.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>2 Clusters are 200ms
apart.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>LBR rate codec G729
is used across trunk.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Therefore I am assuming that I
need to do a hardware MTP on the gateways that my CCM’s cluster is at and
add it the MRGL that is on the trunks each side. A question from your
article, are there any negatives in using the ‘Bundle Outbound Messages
Timer’ parameter?<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Regards<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Gary<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext'>From:</span></b><span lang=EN-US
style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>
Wes Sisk [mailto:wsisk@cisco.com] <br>
<b>Sent:</b> 16 September 2009 14:35<br>
<b>To:</b> Blenkarn, Gary<br>
<b>Cc:</b> cisco-voip@puck.nether.net<br>
<b>Subject:</b> Re: [cisco-voip] Intercluster trunks and H323 outbound
faststart<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Let's take a step back for clarification please.<br>
can you elaborate on what you mean by 'clipping'?<br>
how far apart are your 2 clusters in terms of msec round trip time?<br>
also, do you use low bit rate (LBR) codecs (729, iLBC) over the intercluster
trunks?<br>
<br>
CM's software MTP does not support LBR codecs only G.711. If you are
attempting to invoke an MTP and there is no capabilities match CM will default
to connecting the call anyway but disabling supplementary services. This could
also lead to additional delay.<br>
<br>
In general inbound faststart will not help without the remote peer supporting
outbound faststart. If you noted any difference with only inbound fast
start enabled it is either a fluke or there is something else going on in the
network that needs clarification. The only item I can think of that would
trigger this is some type of SBC or CUBE anchoring calls between 2
clusters. Do you have any such device between the clusters?<br>
<br>
with 150msec RTT to remote sites you may want to review this previous conversation
on cisco-voip:<br>
<a href="http://www.gossamer-threads.com/lists/cisco/voip/114051">http://www.gossamer-threads.com/lists/cisco/voip/114051</a><br>
<br>
<br>
/Wes<br>
<br>
<br>
On Wednesday, September 16, 2009 3:07:45 AM, Blenkarn, Gary <a
href="mailto:Gary.Blenkarn@fmglobal.com"><Gary.Blenkarn@fmglobal.com></a>
wrote:<br>
<br>
<o:p></o:p></p>
<p class=MsoNormal>Hi<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>We have 2 CCM 6.1 clusters. They are connected via a
non gatekeeper controlled trunk. In terms of latency some of the phones
are one way 150ms. We have been getting instances of voice
clipping. Therefore as the SRND states we have implemented Fast
start. Inbound fast start is configured both ends and makes a small
difference. Though outbound Fast start makes the voice clipping
worse? The outbound fast start requires the use of an MTP. It is currently
using the software MTP of the Call Managers in each cluster. <o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>Can anybody provide any information how best practice wise
outbound fast start should be setup please? Should we be using a hardware
MTP for instance on each Cluster?<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>Thank you<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;color:#262424'>Gary
Blenkarn</span></b><o:p></o:p></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;color:#262424'>Senior
Data Networking Analyst</span><o:p></o:p></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;color:#262424'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p>
<div class=MsoNormal align=center style='text-align:center'><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'>
<hr size=2 width="100%" align=center>
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<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:gray'>Registered No. 755780 England<br>
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1 Windsor Dials, Windsor,<br>
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Regulated by the Financial Services Authority.<br>
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</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<pre><o:p> </o:p></pre><pre style='text-align:center'>
<hr size=4 width="90%" align=center>
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