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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 class="moz-txt-link-freetext" 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 class="moz-txt-link-rfc2396E" href="mailto:Gary.Blenkarn@fmglobal.com"><Gary.Blenkarn@fmglobal.com></a> wrote:<br>
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<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" style=""><b><span
style="font-size: 10pt; color: rgb(38, 36, 36);" lang="EN-US">Gary
Blenkarn</span></b><span
style="font-size: 10pt; color: rgb(38, 36, 36);" lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style=""><span
style="font-size: 10pt; color: rgb(38, 36, 36);" lang="EN-US">Senior
Data Networking Analyst<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span
style="font-size: 10pt; color: rgb(38, 36, 36);" lang="EN-US"><o:p> </o:p></span></p>
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<br>
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