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Good catch.<br>
<br>
That depends on users and setting expectations.<br>
<br>
It is dependent on the protocol in use. H.323 users will be impacted at
lower RTT as more packets re required to setup a call. Going way back
in time to <br>
CSCdv68263 No windowing of h245 delays audio cutover in high roundtrip
network<br>
<br>
This happened at 170msec RTT with H.323. We could never get H323 fast
enough to avoid negative user experience ("hello, thank you for
calling" becomes "you for calling"). Moving to MGCP significantly
improved performance.<br>
<br>
On the client side SCCP performs better than SIP as it is less chatty,
there is some commentary here:<br>
<a class="moz-txt-link-freetext" href="http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/8x/netstruc.html#wpmkr1045581">http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/8x/netstruc.html#wpmkr1045581</a><br>
<br>
SIP and SCCP will "work" (YMMV) at some pretty extreme delays (~1
second) but user experience is poor. <br>
<br>
I don't see the comps documented on Cisco.com but they are available
through your Cisco account team.<br>
<br>
/Wes<br>
<br>
<br>
<br>
<br>
On Friday, August 20, 2010 5:48:41 PM, Nate VanMaren
<a class="moz-txt-link-rfc2396E" href="mailto:VanMarenNP@ldschurch.org"><VanMarenNP@ldschurch.org></a> wrote:<br>
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<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">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);">My
understanding of G.114 is
only for the audio path. I think this question is more for the control
path. What
is the user-acceptable latency between the Call Agent and the
Endpoint. Say I
have two phones on the same network, but the call agent is 500ms one
way. Will
the users be happy with the delay to dial tone and delay in audio
connection
setup.<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);">I have
not found information
about this in the SRND.<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);">-Nate<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">From:</span></b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">
<a class="moz-txt-link-abbreviated" href="mailto:cisco-voip-bounces@puck.nether.net">cisco-voip-bounces@puck.nether.net</a>
[<a class="moz-txt-link-freetext" href="mailto:cisco-voip-bounces@puck.nether.net">mailto:cisco-voip-bounces@puck.nether.net</a>] <b>On Behalf Of </b>Wes
Sisk<br>
<b>Sent:</b> Friday, August 20, 2010 3:27 PM<br>
<b>To:</b> H, Tim<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] Call Control / Phone Registration
Distance<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I believe the SRND speaks to this. It should
point to
G.114 for recommended RTT for user experience. Above 150msec user
experience begins to deteriorate. <br>
<br>
/Wes<br>
<br>
On Friday, August 20, 2010 4:15:10 PM, H, Tim <a moz-do-not-send="true"
href="mailto:TimH@trstone.com"><TimH@trstone.com></a>
wrote:<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal">All,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Does Cisco give a limitation on Distance/Latency
on how far
away from a CUCM cluster you can be before they don’t support phone
registration/call control?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I haven’t been able to find documentation, but
if someone
knows where to find that, it would be very helpful to me.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><b><span style="color: rgb(31, 73, 125);">Tim </span></b><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<pre><o:p> </o:p></pre>
<pre style="text-align: center;">
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</pre>
<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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