Cellular private branch exchanges

Claim 1

A private network of interconnected cellular private branch exchanges, said private network being configured for coupling to a public switching network for facilitating cellular communication for a multiplicity of mobile station units, comprising: a first cellular private branch exchange unit configured for coupling to at least a first base station subsystem, including: a first private mobile service switching center for providing, in a cellular domain, mobility management for a first plurality of mobile station units of said multiplicity of mobile station units through said first base station subsystem, a first private branch exchange block coupled to said first private mobile service switching center, said first private branch exchange block representing a first cross-connect node capable of cross-connecting a first cellular bearer data channel with a second cellular bearer data channel for calls between a first mobile station unit of said first plurality of mobile station units and a first phone set, said first phone set representing a phone set in one of said private network and said public switching network, said first mobile station unit being configured for communicating with said first base station subsystem on said first bear data channel, and a first registry coupled to at least one of said first private mobile switching center and said first private branch exchange block, said first registry storing subscriber information pertaining to said first plurality of mobile station units, thereby creating a first private cellular network; and a second cellular private branch exchange unit coupled to said first cellular private branch exchange unit, said second cellular private branch exchange unit configured for coupling to at least a second base station subsystem, including: a second private mobile service switching center for providing, in said cellular domain, mobility management for a second plurality of mobile station units of said multiplicity of mobile station units through said second base station subsystem, a second private branch exchange block coupled to said second private mobile service switching center, said second private branch exchange block representing a second cross-connect node capable of cross-connecting a third cellular bearer data channel with a fourth cellular bearer data channel for calls between a second mobile station unit of said second plurality of mobile station units and a second phone set, said second phone set representing a phone set in one of said private network and said public switching network, said second mobile station unit being configured for communicating with said second base station subsystem on said third bear data channel, and a second registry coupled to at least one of said second private mobile switching center and said second private branch exchange block, said second registry storing subscriber information pertaining to said second plurality of mobile station units, thereby creating a second private cellular network.