NEC M155 User Manual page 44

M155 settings
System Admistrator determined settings
To change the following settings on your M155 please contact your
System Administrator:
The number and name of your M155;
The predefined destination numbers in the telephone book;
The predefined messages and message destination numbers;
The SOS number and SOS message;
Whether or not the urgent message melody is played with
increasing volume;
The automatic answering mode;
The PIN for the connectivity menu;
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4. Repeatedly press the Upper key for a short
time until the display shows:
5. Press the Lower key for a short time.
6. Repeatedly press the Upper key for a short
time until the display shows: the required
option value
On: no audible ring tone or notification given
Off: audible ring tone or notification given.
7. Press the Lower key for a short time.
8. Simultaneously press both keys for a short
time.
9. Simultaneously press both keys for a short
time.
The M155 returns to the idle mode.
Silent
(On or Off).