Patent ID: 7675858

Claim:
A mobility server for providing mobility management information to an application program providing a service to a user equipment as part of an Internet Protocol Multi-media Sub-system (IMS), the mobility server comprising: a mobility manager operable to receive mobility dependent evaluation reports providing at least one of an indication of current conditions for communicating with the user equipment and an indication of a relative location of the user equipment, and to form the mobility management information based on the evaluation reports, and an application programmer's interface operable to communicate call control signalling data between the mobility manager and a session protocol server (S-CSCF) forming part of the IMS, wherein the mobility manager is operable to notify the application program of the mobility management information in response to a subscription for the mobility management information from the application program, the subscription for the mobility management information being provided via the session protocol server (S-CSCF) using the call control signalling data, wherein the application programmer's interface is arranged to provide access to a subscriber information database (HSS) of the IMS, the subscriber information database providing user profile data for the user equipment, the application program being arranged to subscribe to the mobility manager for the mobility management information, if the user profile data indicates that the user equipment is mobile.