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Notice of Minor Network Change

May 23, 1997

No. ATIA-7a (Formerly SIA-7d)


Message Waiting Indicator Tone

Aliant Telecom Inc., on behalf of NBTel Inc., Island Telecom Inc., Maritime Telegraph and Telephone Company, and NewTel Communications Inc., 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 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.


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
Telcordia Technologies. They can be reached at 1-800-521-2673.

If you have any questions on the above, please contact:

Telephony Standards
160 Elgin St., Room 640
Ottawa, Ontario, K1G 3J4 Canada
Tel: (in Canada) 1-877-77-TELCO (83526)
Tel: (Worldwide) (613) 781-7393
Fax: (613) 781-1658


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