US PATENT SUBCLASS 379 / 121
.~.~ At central office

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

111  DF  WITH USAGE MEASUREMENT (E.G., CALL OR TRAFFIC REGISTER) {3}
114  DF  .~ Call charge metering or monitoring {5}
121.~.~ At central office {4}
122  DF  .~.~.~> With display
123  DF  .~.~.~> Paystation (e.g., escrow control)
124  DF  .~.~.~> Pulse counting or accumulating (e.g., "message metering") {3}
129  DF  .~.~.~> Manually set (e.g., key and lock)

DEFINITION

Classification: 379/121

At central office:

(under subclass 114) Subject matter wherein the determination is made at the central switching office to which the telephone set is connected.