US PATENT SUBCLASS 379 / 373
.~.~ Incoming call alerting (e.g., ringing)

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

350  DF  SUPERVISORY OR CONTROL LINE SIGNALLING {5}
372  DF  .~ Signal reception at substation {1}
373.~.~ Incoming call alerting (e.g., ringing) {3}
374  DF  .~.~.~> With music or audible message generation
375  DF  .~.~.~> With electronic call sounder (e.g., tone "ringer")
376  DF  .~.~.~> With visual indication of incoming call

DEFINITION

Classification: 379/373

Incoming call alerting (e.g., ringing):

(under subclass 372) Subject matter where the control or supervisory signal is generated in response to a call directed to a subscriber terminal.

SEE OR SEARCH THIS CLASS, SUBCLASS:

179+, for call alerting on a party line.

251+, for call associated signal generation in a central switching system.