- Message Waiting Indicator
Message Waiting Indicator (MWI) in
telephony, is a Bellcoreterm for an FSK-based telephonecalling feature that illuminates an LEDon select telephonesto notify a telephone user of waiting voicemailmessages on most North American public telephone networks and PBXs.
This technology was introduced in 1995, with the introduction of
CLASS-based callingfeatures 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.
This service is often erroneously associated with the abilities of most
Caller IDstandalone set-top boxes. Caller ID boxes manufactured after 1998, feature an LEDthat blinks green to notify that new calls have been recorded and red to indicate that a subscriber has new voicemail messages waiting. Some units will also display the text "MESSAGE WAITING" (similar to ADSI-compliant telephones). It should be noted that these units do not use Visual FSK to activate their red LEDs, but instead, they briefly "pick-up" the line at certain intervals (normally, within 2 minutes of a new call) to check for a "stuttered" dial tone." The presence of a stutter dial tone will activate a red LED; while absence will de-activate it.
* [http://telecom-info.telcordia.com/site-cgi/ido/newcust.pl?page=idosearch&docnum=GR-1401& Message Waiting Indicator technical details by Bellcore (Telcordia)] , $455.
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