NEC Univerge SV9100 - To Turn off the E911 Alarm at Your Telephone

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4. Dial 911.
To turn off the E911 Alarm at your telephone:
1. Lift the handset or press Speaker.
2. Dial 886.
 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.