US PATENT SUBCLASS 379 / 206
.~.~ At substation

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

201  DF  SPECIAL SERVICES {9}
202  DF  .~ Conferencing {3}
206.~.~ At substation

DEFINITION

Classification: 379/206

At substation:

(under subclass 202) Subject matter wherein the conference call line coupling or switching is performed at a subscriber station.

(1) Note. Included herein are plural line conferencing and audio conferencing.

SEE OR SEARCH THIS CLASS, SUBCLASS:

158, for a key telephone system having a conferencing circuit.