Patent ID: 8351963

Claim:
A method of processing a short message service termination in a network system comprising at least one femtocell, the at least one femtocell comprising a base transceiver station and a Session Initiation Protocol to Internet Operating System adapter, the method comprising: generating a Session Initiation Protocol registration message on behalf of a user equipment, the Session Initiation Protocol registration message comprising a Session Initiation Protocol contact identifier for the user equipment; transmitting the Session Initiation Protocol registration message to a remote Session Initiation Protocol registrar device identifying an address of the femtocell as a recipient address for Session Initiation Protocol signaling destined for the user equipment; receiving, by the Session Initiation Protocol to Internet Operating System adapter of the at least one femtocell from a core network, message content to be delivered to the user equipment serviced by the femtocell; conveying an authentication challenge by the Session Initiation Protocol to Internet Operating System adapter of the at least one femtocell to the base transceiver station; transmitting the authentication challenge from the base transceiver station of the at least one femtocell to the user equipment; conveying a service request from the Session Initiation Protocol to Internet Operating System adapter to the base transceiver station of the femtocell; and transmitting, by the base transceiver station, the message content to the user equipment.