US PATENT SUBCLASS 379 / 257
.~.~ For calling station (e.g., status or progress tones)

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

242  DF  CENTRALIZED SWITCHING SYSTEM {15}
251  DF  .~ With generating of call associated substation signal {3}
257.~.~ For calling station (e.g., status or progress tones)

DEFINITION

Classification: 379/257

For calling station (e.g., status or progress tones):

(under subclass 251) Subject matter where a line condition responsive or call associated signal is transmitted back to the calling terminal.

(1) Note. Included herein are tones indicating the condition or result of a call attempt.