US PATENT SUBCLASS 379 / 231
.~.~ Central office-to-PBX signalling

Current as of: June, 1999
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379 /   HD   TELEPHONIC COMMUNICATIONS

219  DF  PLURAL EXCHANGE NETWORK OR INTERCONNECTION {6}
229  DF  .~ Interexchange signalling {6}
231.~.~ Central office-to-PBX signalling {2}
232  DF  .~.~.~> PBX trunk groups
233  DF  .~.~.~> Direct inward dialing

DEFINITION

Classification: 379/231

Central office-to-PBX signalling:

(under subclass 231) Subject matter including transmission of control or supervisory signals from a central office to a private branch exchange.