[cisco-voip] CUCM Capacity and Maximum Supported Endpoints

[Peter Slow]

Hello Boys and Girls,
    I have a question regarding CUCM Capacity. The SRND states that at this
time with CUCM 8.x, there is a "Maximum of 40,000 configured and registered
Skinny Client Control Protocol (SCCP) or Session Initiation Protocol (SIP)
IP phones or SCCP video endpoints per cluster." ...Elaboration on this would
be helpful.
* Is the 40K limit on the number of devices configurable in the database,
_or_ can we keep adding devices up to a particular point as long as we don't
exceed 40K simultaneous registered phone devices?
* What happens if we get to that limit? would CUCM cease to allow new phones
to register, or would it stop me with an actual imposed limit of 40K
configured phone devices in my database?
* My ultimate goal is to figure out if I should keep growing my megacluster,
or if I need to start making plans to turn up a new one.

Background Info:
I am running 8.6.1.21011-1. I have 12 subscribers doing call processing,
each of which was built with the 7500 user VMWare OVF template. I am
licensed for more. (VMware Installation: 2 vCPU Intel(R) Xeon(R) CPU E5640 @
2.67GHz etc...)
I'm at slightly over 16K _registered_ devices today and we have one-to-one
redundancy. For each subscriber I've got processing calls, I have one that
is almost 100% idle. I have little to no CTI Controlled devices on this
cluster.
My current constraining factor is SAN disk space, so i'd like to save as
much of that as possible. I have plenty of free UCS processing power and
RAM.
I have 4 other similar clusters, all of which need to be able to call each
other. New clusters mean a scarer dialing plan but that can be managed.

-Peter Slow
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