You could create voip dial peers to integrate the CMEs and use VPIM to network CUE. I think the administration in this scenario would get complicated very fast especially if you anticipate any growth. With this number of users, I would suggest taking a hard look at the benefits of moving to Callmanager and Unity.
Your main issue is going to be DHCP. Is using two vlans with two subnets an option? Mainly CME devices are going to talk to the CME based off the TFTP server given to them. Setup two vlans with L3 interfaces with different helper addresses pointing to two different dhcp servers, 1 CME reference per L3 interface. Each DHCP server would have a different TFTP server. You need to understand if they move there phone around though to a different VLAN they won't get connected to the correct CME and thus not register. Configure the CMEs with h323 or sip trunks to allow them to talk to each other. Make sure that you give each CME a different extension range, example 1100 for CME 1 1200 for CME 2. The dial peers would route between with 11.. or 12..
So the quick answer is it can be done, it wont be clean though.
Additionaly are you saying that each CME would have a CUE? If you are trying to share a CUE, I have never setup a CUE that was used externally but it might be able to be done.
Thanks Fred. Your answer clears many of my doubts, but the complexity has cast doubts on using 2 CMEs. Also it seems like there will be more problems involved with IVR integeration with 2 CMEs. Hence, I think I'll go with Call Manager solution.
Wow, 300 users on a Key System (albeit a nice key system). I think sometimes Cisco does too good a job marketing its solutions. In the TDM days, nobody - even management composed of accountants, would've entertained such a solution.
A few design problems:
There's no economy of scale. What will you do when you grow to 350 people?
CUE wasn't built to do this kind of "clustering." Is availability important?
You'll need to either 1) double your circuit count or 2) double inbound/DID PSTN circuit count and mesh outbound dial-plans. Potentially Ugly and Painful to maintain.
Finally, if a CME fails, half your user-base is without a phone.
Seriously, as Brandon suggested, look at CallManager and Unity as a much better fit.
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