Microsoft has released a preview configuration note that contains information about deploying Exchange 2007 UM with a Cisco Call Manager 5.1. The requirements to use the example configurations are -
- PBX Vendor: Cisco
- PBX model: Call Manager 5.1
- PBX software: 220.127.116.1121-12
- Protocol: Direct SIP Connection
It also contains a link to a list of trained Exchange 2007 UM partners (I guess you don't get on that list if you can do it without training ;-)
Download it from here.