US PATENT SUBCLASS 379 / 88.24
.~.~.~ By generated tone

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

67.1  DF  AUDIO MESSAGE STORAGE, RETRIEVAL, OR SYNTHESIS {13}
88.22  DF  .~ Message management {3}
88.23  DF  .~.~ Controlled by subscriber or caller {2}
88.24.~.~.~ By generated tone

DEFINITION

Classification: 379/88.24

By generated tone:

(under subclass 88.23) Subscriber or caller controlled audio signal management system wherein the controlling input is a system generated signal having a specified acceptable pitch.