Defines return codes and reason of the SIP
response message when rejecting an
incoming call for DND. A specific reason is
displayed on the caller’s phone LCD screen.
If set to 486 (Busy here), the caller’s phone LCD
screen displays the reason ―Busy here‖ when
the callee enables the DND feature.
Sets the DND mode for the IP phone.
If set to 0 (Phone), the DND feature is effective
for the IP phone.
If set to 1 (Custom), you can configure the DND
feature for each account.