US PATENT SUBCLASS 379 / 234
.~.~ PBX to central office signalling (e.g., direct outward dialing)

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}
234.~.~ PBX to central office signalling (e.g., direct outward dialing)

DEFINITION

Classification: 379/234

PBX to central office signalling (e.g., direct outward dialing):

(under subclass 229) Subject matter which transmits control or supervisory signal from a private branch exchange to a central switching exchange.