Telephone exchange apparatus having an integrated services digit

Details Telephone exchange apparatus having an integrated services digit Telephone exchange apparatus having an integrated services digit

1993-02-08

1999-12-07

Hong, Harry S.

Telephonic communications

Special services

Anonymous party

370522, 370524, 379208, 379230, 379234, 379241, H04M 342, H04M 700, H04J 312

Patent

active

059996080

ABSTRACT:
A telephone exchange apparatus having a memory for storing the status information of extensions and outside lines. Upon reception of a predetermined setup message from an extension ISDN telephone, if there is a held line, the apparatus connects the line with the extension ISDN telephone which has transmitted the setup message. Thus an extension ISDN telephone can respond to a held call.

REFERENCES:
patent: 4741026 (1988-04-01), Baxter et al.
patent: 5001709 (1991-03-01), Satoh
patent: 5119415 (1992-06-01), Aoyama
patent: 5276687 (1994-01-01), Miyamoto
patent: 5381468 (1995-01-01), Ozawa
patent: 5475744 (1995-12-01), Ikeda

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