Abstract: A communications system is arranged to provide a service to user equipment in accordance with mobility management information. The system comprises a session protocol server (S-CSCF) operable to control the state of a communications session for at least one user equipment in accordance with user profile data, a subscriber information database (HSS) for providing the user profile data for the session protocol server (S-CSCF), and a mobility server. The mobility server comprises a mobility manager operable to receive mobile dependent evaluation reports providing an indication of a current state for communicating with the user equipment and to form the mobility management information based on the evaluation reports. The mobility server includes an application programmer's interface operable to communicate call control signalling data between the mobility manager and the session protocol server (S-CSCF).

Abstract: A security node controls access to an internet protocol multi-media system (IMS) from an application server outside the system. The multi-media system includes a session protocol server (S-CSCF) and a subscriber database (HSS). The security node comprises a database access control node operable to control access to the subscriber database (HSS) from the application server, a session message control node operable to control communication of the messages to the session protocol server from the application server, and a control information database for storing control data. The control data specifies conditions for accessing the subscriber database (HSS) and for communicating with the session protocol server (S-CSCF). The database access control node is operable to control access to the subscriber database in accordance with the control data, and the session message control node is operable to control communication of messages to the session protocol server in accordance with the control data.

Abstract: A communications system is arranged to provide a service to user equipment in accordance with mobility management information. The system comprises a session protocol server (S-CSCF) operable to control the state of a communications session for at least one user equipment in accordance with user profile data, a subscriber information database (HSS) for providing the user profile data for the session protocol server (S-CSCF), and a mobility server. The mobility server comprises a mobility manager operable to receive mobile dependent evaluation reports providing an indication of a current state for communicating with the user equipment and to form the mobility management information based on the evaluation reports. The mobility server includes an application programmer's interface operable to communicate call control signalling data between the mobility manager and the session protocol server (S-CSCF).