Selective call waiting

Details Selective call waiting Selective call waiting

1995-06-30

1996-02-13

Hofsass, Jeffery

Telephonic communications

Special services

Call waiting

379 94, 379201, 379106, 358434, H04M 342

Patent

active

054917441

ABSTRACT:
A selective call-waiting system for telephony use samples transmission on a busy line if the line subscribes to the selective call-waiting service, and avoids interrupting the transmission with a call-waiting signal if the transmission is data-type. If the transmission on the busy line subscribing to the selective call-waiting service is voice-type, the system sends a call-waiting signal. Signal analyzers are disclosed, as well as methods for practicing the invention.

REFERENCES:
patent: 4852151 (1989-07-01), Dittakavi et al.
patent: 5327488 (1994-07-01), Garland
patent: 5432616 (1995-07-01), Fukao et al.
patent: 5448631 (1995-09-01), Cain

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