PBX telephone call control system

Details PBX telephone call control system PBX telephone call control system

1985-11-29

1988-11-08

Brown, Thomas W.

Telephonic communications

Audio message storage, retrieval, or synthesis

379212, 379214, H04M 350, H04M 358

Patent

active

047837969

ABSTRACT:
A PBX telephone call control system is disclosed. The system provides a line interface unit connection between a plurality of subscriber line extensions and a private branch exchange (PBX) switching equipment. The call control system appears to the PBX like any other telephone extension within the office environment and provides the user with more features in conjuction with the pre-existing PBX equipment, providing expanded capabilities at a reasonable expense.

REFERENCES:
patent: 3793487 (1974-02-01), Kilby
patent: 4122308 (1978-10-01), Weinberger et al.
patent: 4139739 (1979-02-01), von Meister et al.
patent: 4327251 (1982-04-01), Fomenko et al.
patent: 4371752 (1983-02-01), Matthews et al.
patent: 4413158 (1983-11-01), Danford
patent: 4420656 (1983-12-01), Freeman
patent: 4484031 (1984-11-01), Gray et al.
"Unanswered Call Diverter", IBM Technical Disclosure Bulletin, vol. 25, No. 7A, Dec. 1982, pp. 3480-3481.

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