Patent ID: 8457631

Claim:
A method for providing application services to a subscriber unit in a wireless communications system comprising at least one application server providing application services to the subscriber unit, and an IP Multimedia Subsystem (IMS) infrastructure including a Proxy-Call Session Control Function (P-CSCF) and a Serving-Call Session Control Function (S-CSCF), the method comprising: receiving by the P-CSCF a subscription request from the application server requesting the P-CSCF to notify the application server of IMS registrations via IMS subscriber registration notification messages; transmitting by the P-CSCF an IMS subscriber authentication request message to the S-CSCF upon receipt of the IMS subscriber registration request message from the subscriber unit; and transmitting by the P-CSCF an IMS subscriber registration notification message to the application server upon receipt of a message from the S-CSCF authenticating the subscriber unit and indicating successful IMS registration of the subscriber unit, wherein the message comprises an identifier of a user associated with the subscriber unit, wherein, upon receipt of the IMS subscriber registration notification message, the application server provides the subscriber unit with application services, and communications between the subscriber unit and the application server bypass the S-CSCF of the IMS infrastructure.