NEC Univerge SV8100 Features And Specifications Manual page 652

Issue 11.0
To turn off the E911 Alarm at your telephone:
1. Lift the handset or press Speaker.
2. Dial 786.
The alarm goes off.

- OR - (if you have a display telephone)
1. Press the Exit key once to turn off the alarm.
2. Press the Exit key again to clear the alarm display.
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UNIVERGE SV8100
E911 Compatibility