Exchange system for incoming calls from direct-in lines

Details Exchange system for incoming calls from direct-in lines Exchange system for incoming calls from direct-in lines

1989-12-12

1992-03-24

Brown, Thomas W.

Telephonic communications

Call or terminal access alarm or control

At switching center

379233, 379244, H04M 338, H04M 714, H04Q 370

Patent

active

050995111

ABSTRACT:
A private branch exchange for controlling the calls terminated from a direct-in line receives a call set-up message containing termination information including termination address information and termination subaddress information. The termination subaddress information is supplied by the originating station and includes a security code and an internal station number. A dial signal deciding part converts the security code into a class-of-service number in accordance with a security code table containing to class-of-service numbers. The services of the private branch exchange which are offered to a subscriber, for example termination to station or origination of call, are determined by indexing a class-of-service table containing class-of-service information using the class-of-service number.

REFERENCES:
patent: 4757529 (1988-07-01), Glapa et al.

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