BT Diverse 2000 - Manual (Page 35)

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Additional features
Call timer
Your Diverse 2000 Executive Handset
automatically times the duration of all
external calls. The handset display shows
the call duration during your call and for
a few seconds after it is completed.
Security
Using and changing the security code
and handset PIN
As a digital phone system, your Diverse
provides excellent security features
against others ‘listening in’ to your calls.
You can also prevent unauthorised use
of the handset(s). Each handset needs
to be registered with the base station.
To do this you need to know and use the
system code.
The default setting for both the handset
PIN and system code is 0000. If you do
not wish to change either you can use
this number for all code and PIN related
functions.
To change the system code please refer
to your base station user guide.