Asterisk Base DID Management Interface

We are looking for DID management system based on Asterisk with friendly web base management and customer interface. Here is the basic requirement: Should have ability to forward DIDs to Googletalk/MSNmessenger/FWD/Gizmo Project , etc OR Regular Phone /PSTN Line OR a IAX2 / SIP address . Billing option for per day/per month/per min charging . The system will have a Admin / Retail users. We are looking for somebody who has already done similar projects in the past. We are open for possible solutions.