Incoming telephone call director

Details Incoming telephone call director Incoming telephone call director

1990-03-19

1991-07-02

Schreyer, Stafford D.

Telephonic communications

Special services

Anonymous party

379375, 379245, 379387, H04M 172

Patent

active

050292021

ABSTRACT:
An incoming telephone call director is intended for use with a Ring-Master service which provides different ring signals on a single telephone line to selectively access one of several devices on the line. The call director ignores a first ring, counts the pulses in the next ring, and then directs the next subsequent ring to a selected telephone or device such as a computer modem, facsimile, telex, etc., on the single telephone line. A different sounding ring signal is used to identify and access each telephone or device on an individual basis. The call director senses an Off-Hook condition for the telephone or any one of the devices and connects that device to the single telephone line to provide a Dial Tone to permit a plurality of such devices to share a single telephone line without interfering with each other or telephone calls on the line. Although the first pulse is ignored for call routing purposes, the call director converts this complete or partial high voltage pulse to power itself in eliminating the requirement for line isolation or a battery operated supply. A lockout circuit allows only one line at a time access, while the system automatically begins waiting for the next call or for one of the internal lines to go Off-Hook following completion of a call.

REFERENCES:
patent: 4674115 (1987-06-01), Kaleita et al.

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