Private branch exchange capable of adding a calling station ID n

Details Private branch exchange capable of adding a calling station ID n Private branch exchange capable of adding a calling station ID n

1994-10-18

1995-12-12

Chin, Stephen

Pulse or digital communications

Spread spectrum

Direct sequence

375142, 375201, 375239, 375245, H04M 1500, H04M 156, H04M 342, H04M 700

Patent

active

054757444

ABSTRACT:
A private branch exchange includes a detector that detects a transmission request to an external line by an extension terminal. An identifying circuit identifies the direct inward dialing number of the transmitting extension terminal and a transmitter transmits the direct inward dialing number of the transmitting extension terminal that is identified by the identifying circuit to the external line.

REFERENCES:
patent: 3725596 (1973-04-01), Maxon et al.
patent: 3967073 (1976-06-01), Anderson et al.
patent: 4942598 (1990-07-01), Davis
patent: 4961217 (1990-10-01), Akiyama
patent: 4994797 (1991-02-01), Breeden
patent: 5008884 (1991-04-01), Yazawa et al.

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