US PATENT SUBCLASS 379 / 192
.~.~.~ Of call duration (e.g., conversation timer)

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

188  DF  CALL OR TERMINAL ACCESS ALARM OR CONTROL {5}
190  DF  .~ Time out {1}
191  DF  .~.~ At switching center {2}
192.~.~.~ Of call duration (e.g., conversation timer)

DEFINITION

Classification: 379/192

Of call duration (e.g., conversation timer):

(under subclass 191) Subject matter wherein a status control or an alerting function is performed when the duration of elapsed time during a call exceeds a predetermined length.