Snom VoIP Phone - Manual (Page 14)

Logon
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By choosing a different line, your originator phone number is changed to
this line. This means that different people can start calls from the same
phone with their own originator phone number and the called phone will
display the current outgoing line information. The current outgoing line
is marked on the idle screen with a black-colored phone icon in front of
the registered SIP line.
DND Mode on/off
Independent from Logon Wizard settings, the DND functionality is
available in the snom menu. DND is short for “Do Not Disturb”. When
this mode is activated, incoming calls will no longer come through to the
phone and you will be completely undisturbed by the phone. If there is
a mailbox set up for you, the call is redirected to it. Before this mode is
activated, you will be asked if you really want to change to this mode.
In idle mode, “DND active!” is displayed in the bottom left-hand corner
of the screen when DND is activated.
Please, keep in mind that contact type “VIP” overrides the DND mode,
i.e., a call from a number you have defined as contact type “VIP” will be
put through to your phone even when DND is active.
Challenge/Authentication
In SIP, a user can also set up authentication requirements for each
registration on the phone. The password for each account name can be
set up via the web interface of the phone in Lin1-7 / Login Information /
Password.
If the authentication password is not set, or set wrongly, the account
will not register on that domain and the phone will be challenged for