Sony HIPATH 500 - Manual (Page 66)

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Privacy/security
66
Activating/deactivating "Do not disturb"
If you do not wish to take calls, you can activate do not
disturb. Internal callers hear the busy tone, external cal-
lers are connected to another phone, which you can
specify (contact your service personnel).
Activating
:
Open the idle menu Æ page 15.
Select and confirm the option shown.
Deactivating
:
Open the idle menu Æ page 15.
Confirm the option shown.
Do not disturb on?
Do not disturb off?
When you lift the handset, you will hear a special
tone (continuous buzzing) reminding you that "Do
not disturb" is activated.
Authorized internal callers automatically override
the DND feature after five seconds.