H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/28
H04Q 11/04 (2006.01) H04M 9/00 (2006.01)
Patent
CA 1287679
- 23 - CONTROLLING KEY-SYSTEM GROUPS FROM A DISTRIBUTED CONTROL SWITCHING SYSTEM 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 cooperatively by multiple, distributed control units but in response to busy/idle data for the shared directory number stored advantageously by only a lead one ofthe 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.
562923
Ahnen David John
Akanbi Charles Obafemi
Bruce Ian Douglas
Kramer Jacqueline Carpenter
Larson Carolyn Darity
American Telephone And Telegraph Company
Kirby Eades Gale Baker
LandOfFree
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