Dual signal triggered message waiting notification system for in

Details Dual signal triggered message waiting notification system for in Dual signal triggered message waiting notification system for in

1994-11-30

1998-09-01

Zele, Krista

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379 67, 379 89, 379201, 379252, 379396, H04M 164

Patent

active

058021663

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.

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