Patent ID: 7991141

Claim:
A system, comprising: a server including a presence and availability control unit and one or more databases for storing one or more handling rules specifying handling of incoming telephone calls for a first telecommunications system; and an intermediary routing control unit configured to access the one or more databases responsive to an incoming telephone call from a second telecommunications system coupled to a switch control, unit and provide the one or more handling rules to the switch control unit for handling routing of the incoming telephone call to enable the incoming call to use facilities of the server by having the ability for the incoming call to be routed by the second telecommunications system, said switch control unit being on a signaling path of the incoming telephone call, wherein said intermediary routing control unit is further configured to receive call state information from the switch control unit and map said call state information into presence state information for the presence and availability control unit; wherein the first and second telecommunications systems are separated from each other by the server and the switch control unit, wherein the server and the intermediary routing control unit are external to the signaling path.