A system, method, and computer readable medium that facilitates processing of a mobile-originated voice call for a mobile station attached with a femtocell system are provided. The femtocell system may broadcast a notification that authentication is required for all system access, e.g., via an overhead message train. The femtocell system receives a call origination request from the mobile station and, in turn, issues a service request message to a convergence server deployed in a core network. The convergence server then engages in an authentication procedure with the mobile station's mobile core network and returns a global challenge response to the femtocell system. Then convergence server may then determine if the mobile station is to be validated and, if so, may continue call set up for the call origination request.