Patent ID: 8150969

Claim:
A method of facilitating access to services of an IP Multimedia Subsystem (IMS) network by user terminals and services located behind an access point to said IMS network, the access point being associated with a subscription to the IP Multimedia Subsystem network, the method comprising: including within an Implicit Registration Set defined for said subscription: a wildcarded Public User Identity or Public User Identity sub-domain representative of a range of Public User Identities; and a wildcard Public Service Identity or Public Service Identity sub-domain representative of a range of Public Service Identities; and at IP Multimedia Subsystem registration of said access point with the IP Multimedia Subsystem network, distributing the Public User Identities and Public Service Identities contained in the Implicit Registration Set to a Serving Call Session Control Function (S-CSCF) allocated to said access point and to a Proxy Call Session Control Function (P-CSCF) to which said access point is attached.