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Gary,<br>
<br>
Yes. need hardware mtp in the MRGL. I do not recall offhand if it
needs to be in the ICT MRGL or in the device's MRGL. My first guess
would be the device's MRGL. A quick test will verify.<br>
<br>
For your MTP's remember that round trip to them can add additional
delay in signaling. Just something to keep in mind when planning the
design and considering impacts.<br>
<br>
The only downside to bundling outbound messages is potential additional
delay. ccm.exe must hold up SCCP messages in order to bundle them into
a single outbound message. Holding the messages will introduce slight
delay. the goal is to have the hold be less time than the latency
cased by TCP RTT.<br>
<br>
<br>
Have you reviewed CM traces or packet captures for a specific instance
of delay to confirm the specific problem? Just to make sure we're
chasing the correct problem.<br>
<br>
/wes<br>
<br>
On Wednesday, September 16, 2009 10:23:01 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"><span style="color: rgb(31, 73, 125);">Hi Wes <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Thank you
very much for your
reply. Answers to your questions:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent: -18pt;"><!--[if !supportLists]--><span
style="font-family: Symbol; color: rgb(31, 73, 125);"><span style="">·<span
style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span><!--[endif]--><span
style="color: rgb(31, 73, 125);">Clipping –
losing the first 2 seconds from the receiver like their hello.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent: -18pt;"><!--[if !supportLists]--><span
style="font-family: Symbol; color: rgb(31, 73, 125);"><span style="">·<span
style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span><!--[endif]--><span
style="color: rgb(31, 73, 125);">2 Clusters are 200ms
apart.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent: -18pt;"><!--[if !supportLists]--><span
style="font-family: Symbol; color: rgb(31, 73, 125);"><span style="">·<span
style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span><!--[endif]--><span
style="color: rgb(31, 73, 125);">LBR rate codec G729
is used across trunk.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">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: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Gary<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<div>
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<p class="MsoNormal"><b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;"
lang="EN-US">From:</span></b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;"
lang="EN-US">
Wes Sisk [<a class="moz-txt-link-freetext" href="mailto:wsisk@cisco.com">mailto:wsisk@cisco.com</a>] <br>
<b>Sent:</b> 16 September 2009 14:35<br>
<b>To:</b> Blenkarn, Gary<br>
<b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:cisco-voip@puck.nether.net">cisco-voip@puck.nether.net</a><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 moz-do-not-send="true"
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
moz-do-not-send="true" 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
style="font-size: 10pt; color: rgb(38, 36, 36);" lang="EN-US">Gary
Blenkarn</span></b><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 10pt; color: rgb(38, 36, 36);" lang="EN-US">Senior
Data Networking Analyst</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 10pt; color: rgb(38, 36, 36);" lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 12pt; font-family: "Times New Roman","serif";"><o:p> </o:p></span></p>
<div class="MsoNormal" style="text-align: center;" align="center"><span
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<hr align="center" size="2" width="100%"></span></div>
<p class="MsoNormal"><span
style="font-size: 7.5pt; font-family: "Arial","sans-serif"; color: gray;">Registered
No. 755780 England<br>
Registered Office: FM Insurance Company Limited<br>
1 Windsor Dials, Windsor,<br>
Berkshire, UK, SL4 1RS<br>
Regulated by the Financial Services Authority.<br>
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<br>
</span><span
style="font-size: 12pt; font-family: "Times New Roman","serif";"><o:p></o:p></span></p>
<pre><o:p> </o:p></pre>
<pre style="text-align: center;">
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<pre><o:p> </o:p></pre>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>cisco-voip mailing list<o:p></o:p></pre>
<pre><a moz-do-not-send="true"
href="mailto:cisco-voip@puck.nether.net">cisco-voip@puck.nether.net</a><o:p></o:p></pre>
<pre><a moz-do-not-send="true"
href="https://puck.nether.net/mailman/listinfo/cisco-voip">https://puck.nether.net/mailman/listinfo/cisco-voip</a><o:p></o:p></pre>
<pre> <o:p></o:p></pre>
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