NEC G355 - Setting the Mandown Prealarm Time

Telephone settings
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5. Press the Select soft key.
:
:
7. Highlight the required value for the option.
8. Press the Select soft key.
9. Press the Clr key one or more times to return
to the idle display.
Setting the Mandown Prealarm time
The mandown Prealarm time specifies the time that I755 DECT
Handset has to stay in the mandown position (i.e., horizontal) before the
mandown situation arises (and the mandown Delay time starts).
To set the Prealarm time, perform the following steps:
4. Highlight the Prealarm time option.
5. Press the Select soft key.