Cisco Call Manager can do anything you need it to do (and plenty you don't need it to do too).

We use Cisco Unified Communications Manager (Call Manager) across our whole agency to manage all of our VoIP phones, users and gateways. We also use it to integrate with our paging systems and attendant console solution. It has enabled us to centrally manage all of this, which was previously managed individually at every location, and to allow phone number mobility between locations and also with users' mobile devices.