A system, method, and computer readable medium for facilitating mobile station registration and authentication via a femtocell system are provided. A femtocell system receives a registration request from a mobile station and transmits a registration request to a core network on behalf of the mobile station. The registration request transmitted by the femtocell system preferably includes a register identifier generated by the femtocell system. The convergence server may be located in an Internet Protocol core network and may be configured to emulate a mobile switching center. On receipt of a registration request from the femtocell system, the convergence server may engage in a registration and authentication procedure with a radio access network Home Location Register and/or Authentication Center on behalf of the mobile station. Alternatively, the convergence server may be located in an Internet Protocol Multimedia Subsystem (IMS) core network in which the convergence server is configured as an IMS application server. In this configuration, the femtocell system transmits the register request to a serving-call session control function that initiates a third-party registration process with the convergence server.