Two-line apparatus for telephone intercom

Details Two-line apparatus for telephone intercom Two-line apparatus for telephone intercom

1995-05-05

1998-07-14

Kuntz, Curtis

Telephonic communications

Multi-line or key substation system with selective switching...

With intercom system

379171, 379176, 379186, 379199, H04M 100, H04M 160, H04M 1300, H04M 166

Patent

active

057816220

ABSTRACT:
An apparatus for providing an intercom function on a telephone, without the need for an external power supply, having DTMF or pulse capabilities including an intercom operation device arranged for connection to a DTMF or pulse telephone line and to a DTMF or pulse telephone instrument. The apparatus includes a device for sensing an extension selection dual input from the DTMF or pulse telephone instrument and transmitting a corresponding extension address signal over the DTMF or pulse telephone line. Also included is an apparatus for sensing a received extension address signal from the telephone line, determining whether it corresponds to the telephone instrument to which the intercom operation apparatus is connected and, upon determination of correspondence, providing an extension selection ring output.

REFERENCES:
patent: 4899378 (1990-02-01), Hamer
patent: 5119418 (1992-06-01), Dupillier
patent: 5247570 (1993-09-01), Bowen
patent: 5280523 (1994-01-01), Lee
patent: 5283825 (1994-02-01), Druckman et al.
patent: 5425089 (1995-06-01), Chan et al.

Affiliated with

Also associated with

Rating

Two-line apparatus for telephone intercom does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Two-line apparatus for telephone intercom, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two-line apparatus for telephone intercom will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1891194