US PATENT SUBCLASS 379 / 133
.~ Call traffic recording or monitoring

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}
133.~ Call traffic recording or monitoring {2}
134  DF  .~.~> At central station {4}
140  DF  .~.~> At subscriber {1}

DEFINITION

Classification: 379/133

Call traffic recording or monitoring:

(under subclass 111) Subject matter for making a determination of the total number of calls, or the number of calls per unit time.

SEE OR SEARCH THIS CLASS, SUBCLASS:

34, for measuring the response time of telephone equipment.