Line interface unit for caller-controlled receipt and delivery of voice messages

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 4825460
SERIAL NO

07209891

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A line interface unit for controlling receipt and delivery of voice messages over a telephone system having a voice message facility connectable to at least one calling station and a called station via a central office. The interface unit comprises a first switch connected to the calling station in the tip and ring lines and a second switch connected to the central office in the tip and ring lines, the switches having first and second positions and wherein said signals on the tip and ring lines are connected directly between the calling station and the central office when each of the switches is in the first position. In operation, a control circuit of the line interface unit responds to detection of a busy/no answer condition at the called station for switching the first switch from its first to second position to connect a speech circuit to the calling station for issuing a prompt. After the prompt is issued, the control circuit responds to receipt of a DTMF signal or additional coinage from the calling station for switching the second switch from first to second position to connect a speed-dial circuit to the central office for dialing the voice message facility. The control unit then responds to receipt of a DTMF signal from the voice message facility for switching the first and second switches from their second positions back to their first positions to connect the calling station to the voice message facility.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
Messager PartnersDALLAS, TX3
MESSAGEPHONE, INC.DALLAS, TX1

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Carter, Howard E Denton, TX 7 215
Pierce, Byron C Garland, TX 7 215
Pugh, Joel A Dallas, TX 17 1482

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Amtelco (1)
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MESSAGEPHONE, INC. (1)
* 4766604 Method for receiving and delivering voice messages 125 1986
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
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RPX CLEARINGHOUSE LLC (4)
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* Cited By Examiner