Abstract: A data network comprises proxy-call session control functions (P-CSCFs) serving user equipments. Each P-CSCF can request resource reservation from an associated policy manager. A serving-call session control function receives a first call session setup message and determines a set of terminating user equipments associated with a terminating user identity of the setup message. It then transmits a call session initialization message to each identified terminating user equipment via an associated P-CSCF. This message includes a session identity indication and a forking indication which indicates if the first call session is a forked call session. The P-CSCFs and/or the policy managers then restrict the resource reservation for two or more user equipments having the same session identity and forking indications indicative of a forked call session setup to the resource requirement for only one of the user equipments. This may reduce resource usage for forked call sessions.

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 data network comprises proxy-call session control functions (P-CSCFs) serving user equipments. Each P-CSCF can request resource reservation from an associated policy manager. A serving-call session control function receives a first call session setup message and determines a set of terminating user equipments associated with a terminating user identity of the setup message. It then transmits a call session initialization message to each identified terminating user equipment via an associated P-CSCF. This message includes a session identity indication and a forking indication which indicates if the first call session is a forked call session. The P-CSCFs and/or the policy managers then restrict the resource reservation for two or more user equipments having the same session identity and forking indications indicative of a forked call session setup to the resource requirement for only one of the user equipments. This may reduce resource usage for forked call sessions.

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 system and method for call origination by an application server in an internet protocol multimedia core network subsystem includes a first step of providing a public user identity for a user. A next step includes storing a service parameter in a service profile of the user, the service parameter indicating whether to allow/disallow the application server to initiate call requests on behalf of the public user identity. If the service parameter allows the application server to initiate call requests, the system unblocks calls originated by the application server on behalf of the user. If the service parameter disallows the application server to initiate call requests, the system blocks calls originated by the application server on behalf of the user.

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.