Patent ID: 8274929

Claim:
An enterprise mobile network for providing wireless service within a coverage area associated with an enterprise using licensed radio frequency spectrum, the enterprise mobile network comprising: a base station subsystem (BSS) deployed on a premises of the enterprise to provide wireless capacity within the coverage area using the licensed radio frequency spectrum; and a mobile switching subsystem (MSS) communicatively coupled to a public land mobile network; wherein the BSS is communicatively coupled to the MSS using an Internet Protocol (IP) network; wherein the MSS is configured to implement at least some networking switching subsystem (NSS) functions for local subscribers of the enterprise mobile network; and wherein the MSS comprises a Session Initiation Protocol (SIP) user agent to communicate with at least one SIP server, wherein the SIP user agent is configured to function as a first SIP client when communicating with the SIP server; and wherein the MSS is configured to use the SIP user agent to establish a communication session between a mobile device that wirelessly communicates with the BSS using the licensed radio frequency spectrum and a second SIP client coupled to the SIP server.