BELL INDUSTRY ADVISORY

Message Waiting Indicator Tone

Bell Canada announces a change of the Audible Message Waiting Indication (AMWI), as currently used on the Companies' DMS-100 switches. The change is scheduled to begin by 1Q98.

The AMWI had been previously disclosed in TAPAC Bulletin No. 91-04, dated May 1, 1991. In future, the standard Message Waiting Indicator Tone as defined by Bellcore will be used throughout the Bell network.

Compatibility Impact:

Some terminals that are designed to recognize a message waiting indicator tone may be impacted. The standard message waiting indicator tone reverts to normal steady dial tone after two seconds.

Documentation:

The standard Message Waiting Indicator Tone is described in Bellcore Technical Reference TR-NWT-000506, LSSGR LATA Switching Systems Generic Requirements, Signaling, Issue 3, September 1991, Revision 1, November 1991.  This document may be ordered from Bellcore.   They can be reached at 1-800-521-2673.

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