Call control network, access control server and call control method

摘要

A call control network for controlling calls in a mobile communication network (30) is described. The mobile communication network comprises at least one circuit switching access network (33) that supports circuit switched communications. A call control system (23) for providing call related functions for packet switched communications, arranged to send and receive call control information in accordance with a first call control protocol (SIP) for packet switched communication and to identify resources with network identifiers (URI) of a predetermined syntax, is provided. An access control system (22) is provided which terminates said first call control protocol (SIP) and said second call control protocol (RANAP/BSSAP), and which has interworking functions, such that at least a part of said call related functions provided by said call control system (23) can also be applied to circuit switched communications, and where at least one of said interworking functions comprises a procedure for generating a network identifier (URI) of said predetermined syntax for a mobile station accessing via said second access control system (22), said procedure being arranged to generate said network identifier (URI) on the basis of a call destination identifier of said mobile station.