Coordinating telephones or adjuncts on the same loop

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

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Details

379376, 379373, 379194, 379195, 379372, H04M 100

Patent

active

059370580

ABSTRACT:
When two or more telephone sets are in use on the same subscriber's loop, their activities may not be properly detected or monitored by the central office switch. The present invention provides a method of and an apparatus for coordinating activities so that call waiting caller ID or off-hook caller ID or other service features can work even if there are off-hook extensions on the same loop. The invention ensures that only one set among a plurality of off-hook sets responds to the switch.

REFERENCES:
patent: 4351986 (1982-09-01), Fechalos
patent: 4893334 (1990-01-01), Parnello
patent: 5038140 (1991-08-01), Ikeuchi
patent: 5222122 (1993-06-01), Hamilton et al.
patent: 5263084 (1993-11-01), Chaput et al.
patent: 5283825 (1994-02-01), Druckman et al.
patent: 5392341 (1995-02-01), Wilkinson et al.
patent: 5581598 (1996-12-01), Hachiga
patent: 5619561 (1997-04-01), Reese
"The Analog Display Services Interface", B.K. Schwartz, IEEE Communications Magazine, vol. 31, No. 4, Apr. 1993, pp. 70-75.

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