US PATENT SUBCLASS 379 / 130
.~.~ At subscriber station

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}
130.~.~ At subscriber station {1}
131  DF  .~.~.~> Time controlled {1}

DEFINITION

Classification: 379/130

At subscriber station:

(under subclass 114) Subject matter wherein the determination is made at the location of the telephone set being monitored.