We need to make a decision about the IPT solution for our branch office in India.
The main office in UK has CCM Cluster.
Both the offices are connected via MPLS.
Number of users in branch office : 300 (can grow to 500)
Branch office should be able to communicate with the main office via IP network.
We would prefer redundancy for our call control application.
We are also planning to have voicemail for all users.
As usual, the business wants a low cost solution.
we have the follwing doubts.
1. Given our requirements which is the best solution, CM or CME or CUCMBE?
2. Does CME or CUCMBE support clustering and offer redundancy like CCMs?
3. Incase if we are going CM route, will we face any restrictions when we use 7816 MCS servers?
Please help us make the correct choice.
i don't think clustering is available in CME and the max phones supported are 250 using a 3845 router...
when you have one callmanager with 300-500 users, and it fails you may not be able to have SRST for that many users and so your phone service may be down for maybe a day or longer..
having both CM and Unity on the same box is also a risk, when it crashes, it may take longer to recover 2 applications than 1.
if it is business critical, you probably need 2 7825s for CMs and maybe 1 server for Unity depending on the number of ports and users you need...or you may want to have redundant unity servers.