Patent ID: 8437342

Claim:
A method of providing location information to a Serving Call Session Control Function (S-CSCF) in an IP Multimedia Subsystem (IMS) network, the method comprising performing the following at the S-CSCF: registering a first contact associated with a pair of Private User Identity and Public User Identity in an IMS subscription and also associated with a non-mobile access, and receiving location information associated with the first contact; registering a second contact for the same IMS subscription and associated with the same pair of Private User Identity and Public User Identity as that used for registering the first contact, the second contact being associated with a mobile access; and receiving one of the following from an Interrogating-Call Session Control Function (I-CSCF): location information associated with the second contact, the location information associated with the second contact having been previously sent to the I-CSCF from a Home Subscriber Server (HSS) after the second contact is registered at the HSS, and an indicator indicating that location information associated with the second contact is available at the HSS, wherein location information associated with the second contact is then received by the S-CSCF in response to a request sent from the S-CSCF to the HSS requesting the location information.