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Dual signal triggered message waiting notification system for indicating storage of different types of messages awaiting retrieval

  • US 5,802,166 A
  • Filed: 11/30/1994
  • Issued: 09/01/1998
  • Est. Priority Date: 11/30/1994
  • Status: Expired due to Fees
First Claim
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1. A message waiting notification system comprising:

  • a telephone provider'"'"'s off premise central switching office for transmitting predetermined asynchronous Frequency Shift Keying (FSK) signals and/or audible tones over a telephone line indicating different types of electronically stored communication messages awaiting retrieval, said different message types including voice mail, E-mail, fax mail and video mail; and

    a Dual Signal Triggered Message Waiting Indicator (DSTMWI) circuit connected to said central switching office via said telephone line, said DSTMWI circuit comprising notification means for providing visual notification of any combination of said different message types in response to receiving FSK signals and/or audible tones indicative of said combination from said central switching office over said telephone line.

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