Actually this is not solely Cisco's issue. When you install the CUCM in a ESXi4 environment (which is the only one supported because this is how UCM runs on the UCS servers) then it runs just fine. When running UCM in VMware Workstation the network connectivity is gone after the VMware tools have been loaded. There is a free ESXi4 version you can download from VMware. This is recommendable if you dedicate a server for your VMs. It has the big advantage of less overhead, smaller footprint and greater efficiency. I am using VM-Workstation because I use the Host for other functions as well, so this was the better way for me. Make sure you use an Intel platform for the underlying server. ESXi4 runs on AMD as well, but you will run into the problem that media services will not start without modifications in root. This would mean MOH, Conferencing and Announciator will not be available. This does not affect other functions like call routing. I use an ASUS motherboard with an i5, 16Gb ram and one disk per VM. This way I can run up to 7 servers with 2Gb ram each.
just for fun, here a picture with my "wall server" to run all this stuff. This post is in a discussion in Cisco's learning network.
https://learningnetwork.cisco.com/message/159944#159944
Best
Patrick
