Telephonic communications – Multi-line or key substation system with selective switching... – With special service
Patent
1987-07-23
1988-12-13
Ng, Jin F.
Telephonic communications
Multi-line or key substation system with selective switching...
With special service
379165, 379269, 379274, H04Q 520, H04M 356
Patent
active
047916621
ABSTRACT:
A distributed control switching system where calls, to and from a directory number that is shared by a key-system group of terminals, are processed cooperatiavely by multiple, distributed control units but in response to busy/idle data for the shared directory number stored advantageously by only a lead one of the control units. In addition to processing a call, for example to complete a connection to or from one of the terminals of the group, the multiple control units also cooperate as the call progresses to inform each of the group terminals of the call status as though the terminals were connected in parallel to a central office line as in an electromechanical key system.
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Ahnen David J.
Akanbi Charles O.
Bruce Ian D.
Kramer Jacqueline C.
Larson Carolyn D.
American Telephone and Telegraph Company AT&T Bell Laboratories
Chan Wing Fu
Ng Jin F.
Watland Ross T.
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