Exchange 2007 UM Configuration

One question that I can more or less guarantee that I will asked when talking about Exchange 2007 Unified Messaging is what PBX's are supported..? Well the answer to the question is here 

Natural progression then goes on to ask, "Well how do you do it..?" ... this is when it can get challenging...! :) Not being a Telco person by trade it can be a daunting experience trying to understand all the terminology to make sense on how to configure it.

Well, the subsequent question is answered here it is still in it's infancy, as these docs are preview, but bookmark this site as it will become incredibly useful when you deploy UM.