US PATENT SUBCLASS 379 / 164
.~ Line status indication or call alerting

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

156  DF  MULTI-LINE OR KEY SUBSTATION SYSTEM WITH SELECTIVE SWITCHING AND CENTRAL SWITCHING OFFICE CONNECTION {7}
164.~ Line status indication or call alerting

DEFINITION

Classification: 379/164

Line status indication or call alerting:

(under subclass 156) Subject matter including circuitry to provide a perceptible indication of an incoming call or other status of one or more of the lines connected to a terminal.