Abstract: A subscriber server system 200 for a cellular communication system 100 comprises a subscriber data storage 205 which stores public identities associated with subscribers of the cellular communication system. A request processor 207 receives an identity information request message, such as a SIP OPTIONS message, from a remote station 101. The identity information request message comprises a first public identity for a subscriber of the cellular communication system. A public identity processor 209 determines a first set of public identities which comprises a plurality of public identities associated with the subscriber in response to the public identity. A message generator 211 generates an identity response message, such as a SIP 200OK message, comprising the first set of public identities. The identity response message is then transmitted to the first remote station 101.

Abstract: A subscriber server system 200 for a cellular communication system 100 comprises a subscriber data storage 205 which stores public identities associated with subscribers of the cellular communication system. A request processor 207 receives an identity information request message, such as a SIP OPTIONS message, from a remote station 101. The identity information request message comprises a first public identity for a subscriber of the cellular communication system. A public identity processor 209 determines a first set of public identities which comprises a plurality of public identities associated with the subscriber in response to the public identity. A message generator 211 generates an identity response message, such as a SIP 200OK message, comprising the first set of public identities. The identity response message is then transmitted to the first remote station 101.

Abstract: A method and information processing system provide reliability in an IP multimedia subsystem network. The method includes monitoring a S-CSCF (210) for its availability. The method also includes determining, based on the monitoring, that the S-CSCF (210) is unavailable. A wireless device (106) registered with the S-CSCF (210) is notified that the S-CSCF (210) is unavailable. Optionally, the wireless device (106) is notified to re-register with a new S-CSCF.

Abstract: An Internet Protocol Multimedia Subsystem (IMS)-based communication system comprising multiple access networks, wherein each access network of the multiple access networks implements a different transport protocol than the other access networks of the multiple access networks, includes an application plane Quality of Service (QoS) policy server that, with the support of a Quality of Service (QoS) Agent, coordinates and manages QoS policies across the multiple transport networks, thereby providing for centrally consistently managed QoS policies, which policy management is transport control plane and network topology agnostic.