U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

PBX voice mail interface

Patent 4930153 Issued on May 29, 1990. Estimated Expiration Date: Icon_subject April 7, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Patent References

Universal receiver/sender
Patent #: 4076965
Issued on: 02/28/1978
Inventor: Olsen ,   et al.

Signal processor for use with a telephone system and a digital transmission line
Patent #: 4254304
Issued on: 03/03/1981
Inventor: Fulghum ,   et al.

Series connected interceptor
Patent #: 4629831
Issued on: 12/16/1986
Inventor: Curtin ,   et al.

Signaling protocol channel unit
Patent #: 4636584
Issued on: 01/13/1987
Inventor: Binkerd ,   et al.

PBX Intercept and caller interactive attendant bypass system
Patent #: 4696028
Issued on: 09/22/1987
Inventor: Morganstein ,   et al.

PBX DID and E and M tie trunk integration adapter and method
Patent #: 4792967
Issued on: 12/20/1988
Inventor: Ladd ,   et al.

Direct inward dial integration apparatus Patent #: 4811381
Issued on: 03/07/1989
Inventor: Woo ,   et al.

Inventor

Assignee

Application

No. 338514 filed on 04/07/1989

US Classes:

379/233, Direct inward dialing379/88.19, Call source identification379/235, Voice frequency signalling over trunk379/240Interexchange trunk circuit

Examiners

Primary: Brown, Thomas W.

Attorney, Agent or Firm

International Classes

H04M 003/50
H04M 007/14

Abstract

An interface is described which attaches between the incoming trunk lines from a central office and a PBX system and which monitors the communication between the central office and the PBX to record the signals representative of telephone extension of a called party for later downloading to telephone peripheral equipment attached to the PBX, such as voice mail systems. The interface passively monitors the line during handshake communication between the central office and the PBX and receives the digits of the dialed extension and stores them in memory. The interface then monitors the line for a request to send from the peripheral equipment attached to the PBX. When the request is received, the interface assumes supervision of the telephone line by terminating the line to the central office and the line to the PBX. The interface then downloads the digits of the dialed extension to the telephone peripheral equipment, such as a voice mail system, for identifying the extension to which the message belongs. Two embodiments of the present invention are described in which the interface can operate with either DID trunk lines attached to a PBX system or with POTS (Plain Old Telephone Service) lines attached to a PBX.

Other References

  • "Patent Covers PBX-Integrated Call Routing", Voice News, Mar. 198
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