Patent ID: 8510457

Claim:
A method for use by a Serving Call/Session Control Function (S-CSCF) of an IP Multimedia Subsystem (IMS), comprising the steps of: receiving a Session Initiation Protocol (SIP) message containing information relating to a private user identity/public user identity (IMPI/IMPU) pair; identifying the type of information contained in the SIP message; identifying whether or not a previous data package relating to the IMPI/IMPU pair has previously been sent to a Home Subscriber Server (HSS) for storage; creating a new data package containing the information to be sent to and stored by the HSS; sending to the HSS a Server-Assignment-Request (SAR) command containing an Attribute Value Pair (AVP) including an instruction to the HSS and the new data package; wherein, if a previous data package for the IMPI/IMPU pair has been sent to the HSS for storage, then the new data package combines the information relating to the IMPI/IMPU pair received in the SIP message with the information contained in the previous data package.