US PATENT SUBCLASS 379 / 233
.~.~.~ Direct inward dialing

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


379 /   HD   TELEPHONIC COMMUNICATIONS

219  DF  PLURAL EXCHANGE NETWORK OR INTERCONNECTION {6}
229  DF  .~ Interexchange signalling {6}
231  DF  .~.~ Central office-to-PBX signalling {2}
233.~.~.~ Direct inward dialing

DEFINITION

Classification: 379/233

Direct inward dialing:

(under subclass 231) Subject matter wherein a call address designating a terminal connected to a private branch exchange will control connection to such a terminal.