[ S N O M 1 9 0 A D M I N I S T R A T O R M A N U A L V 3 . 0 0 ]
DND
DND functionality is available on the idle screen of the snom 190 phone. DND is short for “Do Not Disturb“. If this mode is activated, it means that 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 calls are redirected to this. Before this mode is activated you will be asked if you really want to change to this mode.
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In idle screen, “DND” is displayed in the middle of the first line of the screen if the mode is activated.
Challenge/Authentication
In SIP, an administrator can also set up authentication requirements for each registration on the phone. The password for each account name on its realm (domain/registrar) can be set up through the web interface of the phone in Settings/SIP/Authentication.
If the authentication password is not set, or is set wrongly, the account will not register on that domain and the phone will be challenged for that line. A challenge response will ask for the correct username. This can look like: