Patent ID: 7283513

Claim:
A call control network for controlling calls in a mobile communication network, said mobile communication network comprising at least one circuit switching access network that supports circuit switched communications and at least one packet switching access network that supports packet switched communications, comprising a call control system for providing call control related functions for packet switched communications, arranged to send and receive call control information in accordance with a first call control protocol for packet switched communication, a first access control system for handling call control related signalling associated with packet switched communications to and from mobile stations in said mobile communication network, and a second access control system for handling call control related signalling associated with circuit switched communications to and from mobile stations in said mobile communication network, wherein said second access control system is arranged to exchange call control information with said call control system by using said first call control protocol, where said second access control system terminates said first call control protocol, and wherein said second access control system is arranged to exchange call control information with said circuit switching access network by using a second call control protocol for circuit switched communication, where said second access control system terminates said second call control protocol, and said second access control system having interworking functions, such that at least a part of said call related functions provided by said call control system can also be applied to circuit switched communications.