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Message-waiting indicator
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Message-waiting indicator : ウィキペディア英語版
Message-waiting indicator

A message-waiting indicator (MWI) in telephony, is a Telcordia Technologies (formerly Bellcore) term for an FSK-based telephone calling feature that illuminates an LED on selected telephones to notify a telephone user of waiting voicemail messages on most North American public telephone networks and PBXs.
As described in Telcordia Generic Requirements document (GR-283-CORE ), a Message_Waiting_Indicator (MWI) is a mechanism that informs the subscriber about the status of recorded messages. The subscriber may subscribe to a notification feature that makes use of the status of this MWI.
==Difference to audible message waiting indicators==
This feature is also frequently called (and abbreviated) as visual message waiting indicator (VMWI). A VMWI, as defined in (Telcordia GR-1401-CORE ), is a stored program controlled switching (SPCS) system feature that activates and deactivates a visual indicator on customer-premises equipment (CPE) to notify the customer that new messages are waiting. VMWI differs from existing features that use other message indicators, such as audible stuttered dial tone, in that it activates a visual indicator on the CPE. The visual indicator may be as simple as lighting or flashing a light-emitting diode (LED), or as advanced as displaying a special message on a liquid-crystal display (LCD).
This technology was invented by Jerome (Jerry) Schull and Wayne Howe at BellSouth's Advanced Technology R&D group in 1992 and was issued as US Patents (#5,363,431 ) and (#5,521,964 ). It was introduced in 1995, with the introduction of CLASS-based calling features and ADSI. It was at one time only compatible with ADSI-compliant telephones but is now compatible with any customer premises equipment (CPE) that simply responds visually to visual FSK.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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