I have been dealin primarily with Mitel 3300 ICP, but now I've had a request to review placing a Cisco Analog Trunk Gateway solution overseas with a controller side stateside.

I have been combing throug the CISCO site and reading through their documentation. Does anyone know of a good location to go to to run through a primer on the differences between Cisco Call manager, Unified Call Manager / Express, the different routers that support it, and the gateways? Thanks.