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CM will ring *many* instances of a shared line. I believe common
testing caps around 100 instances of a shared line. However, that
certainly adds extra load to the system. Is that many shared lines
really the best design? Review carefully to see if similar can be
delivered through other features such as linegroups and call park.<br>
<br>
They way you say "site" makes me think these may be a remote site.
Concurrent signalling to large groups of phones may cause contention in
your priority queues for call signaling. This is overcome by a
combination of (protocol, message bundling, and link speed).<br>
<br>
Protocol - SCCP is essentially a binary protocol so signaling requires
minimal number of bits on the wire. SIP is text based and requires
more bits by several orders of magnitude. Use SCCP if possible.<br>
message bundling - CM service parameter to buffer SCCP messages for a
few msec so that multiple SCCP messages can be placed in the same TCP
segment which increases efficiency as fewer TCP headers are passed<br>
link speed - in the end its about how fast you can push bits through
the single-file-line of the interface<br>
<br>
There is good information in the SRND about this:<br>
<a class="moz-txt-link-freetext" href="http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/7x/netstruc.html#wpmkr1045581">http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/7x/netstruc.html#wpmkr1045581</a><br>
<br>
/Wes<br>
<br>
On Tuesday, March 10, 2009 7:13:58 AM, Joe Pollere (US)
<a class="moz-txt-link-rfc2396E" href="mailto:Joe.Pollere@us.didata.com"><Joe.Pollere@us.didata.com></a> wrote:<br>
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<p class="MsoPlainText">We are in the process of converting a Nortel
PBX over to
UCM 6.1.3 and they have a few dns that are shared amongst many phones.
I
remember reading somewhere that there was a recommended maximum number
of
shared lines you could have configured with the same dn. Does anyone
know what
that recommendation is. These would all be within the same site using
7961's.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Thanks,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> <o:p></o:p></p>
<p class="MsoPlainText">Joe<o:p></o:p></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
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