Dual signal triggered message waiting notification system for indicating storage of different types of messages awaiting retrieval
US5802166A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1994 |
| Grant date | Sep 1, 1998 |
| Priority date | — |
| Expiry date | Nov 30, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/537
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A message waiting notification system comprising a telephone provider's off premise central switching office connected to a Dual Signal Triggered Message Waiting Indicator (DSTMWI) circuit via a telephone line is disclosed. The central switching office transmits predetermined asynchronous Frequency Shift Keying (FSK) signals and/or audible tones indicating different types of electronically stored communication messages awaiting retrieval, such as voice mail, E-mail, fax mail and video mail. Responsive to receiving the FSK signals and/or audible tones from the central switching office via the telephone line, the DSTMWI circuit provides visual notification of any combination of different types of the electronically stored communication messages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.