US Patent 8000739 Single number presentation for dual-mode phones

Providing a single number presentation to the party called by a dual-mode phone. The operation of the cellular side of a dual-mode phone is altered such that when the user attempts to place an outgoing call using the cellular phone, the call is redirected to a preprogrammed incoming phone number associated with the enterprise. When the enterprise PBX answers this call, the dual-mode phone transmits the desired number to the enterprise PBX. The enterprise PBX then places the call to the desired number, and in the process transmits the caller-id information assigned to the dual-mode phone.