Control of non-locally switched telecommunication services

Details Control of non-locally switched telecommunication services Control of non-locally switched telecommunication services

1989-11-29

1991-11-05

Dwyer, James L.

Telephonic communications

Special services

Service trigger

379219, 379220, H04M 700

Patent

active

050635921

ABSTRACT:
Foreign exchange subscriber service is provided via a local ISDN exchange which selectively establishes switched connections between a customer's ISDN terminal and a trunk circuit dedicated to the foreign exchange line. The same ISDN subscriber line may be used for local service and foreign exchange service to several different foreign exchanges. The customer's ISDN terminal has a separate call appearance for each foreign exchange line and call appearance information is used in ISDN messages transmitted between the local exchange and the customer's terminal to uniquely identify local and foreign exchange service connections.

REFERENCES:
patent: 4611096 (1986-09-01), Asmuth et al.
patent: 4757526 (1988-07-01), Foster et al.
patent: 4811334 (1989-03-01), Matt

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