I need to install CUCM to serve 3.500 users, is it possible to install it on a server IBM x3650 2 quad core, 4GB RAM, 73GB HD, 4 ethernet?

If a company is composed by three different site, in each site is installed a CUCM in order to manage an IP-Phone network, the sites are in different location in the same city and are connected eachone with eachothers.Is it possible to replace the 3 ...

I've two questions about interaction between CUCM and DHCP server.1. In a network with a CUCM, IP-Phones and a DHCP server: if the DHCP server goes down, does the IP-Phones work?if the DHCP server is replaced with another DHCP server, are there chang...