Private branch exchange capable of analyzing information receive

Details Private branch exchange capable of analyzing information receive Private branch exchange capable of analyzing information receive

1993-07-02

1996-01-02

Hofsass, Jeffery A.

Telephonic communications

Centralized switching system

Class of service determination or transmission

358442, 358468, 370 601, 3701101, 379 93, 379100, 379233, 379234, H04M 300, H04M 1100, H04M 700, H04J 312

Patent

active

054816050

ABSTRACT:
A method of deciding whether an extension terminal is called or not is provided. The kind of communication is recognized on the basis of a set-up message received from the ISDN. Whether the extension terminal is called or not is decided on the basis of the result of comparison between the kind of the extension terminal and the kind of the communication recognized. There is also provided a private branch exchange comprising: a detector to detect a reception from an analog external line; a digital interface to connect a terminal corresponding to a procedure for a digital line; and a judging circuit to judge whether the terminal corresponds to a procedure for an analog line or not, wherein when the judging circuit decides that the terminal corresponds to the procedure for the analog line when the reception is detected by the detector, the digital interface transmits the set-up message to the terminal.

REFERENCES:
patent: 4961185 (1990-10-01), Sawada
patent: 5023868 (1991-06-01), Davidson et al.
patent: 5042028 (1991-08-01), Ogawa
patent: 5050005 (1991-09-01), Kagami
patent: 5062133 (1991-10-01), Melrose
patent: 5067128 (1991-11-01), Tsuchida
patent: 5142568 (1992-08-01), Ogata et al.
patent: 5233648 (1993-08-01), Nakamura

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