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You can use DND to reject incoming calls automatically on the phone. The message "n New Missed Call(s)" ("n" indicates the number of missed calls) will appear on the LCD screen, and callers will receive a busy message.

How to config and Use

Check the DND setting in 3CX phone system side
Log in 3CX Management Console -> Settings -> Dial Codes

Code of Set Do Disturb OFF: If you press the DND key to set the DND ON status on the phone, the phone will send the DND ON code to the 3CX server to Synchronize the DND status on the server side.
Code of Set Do Disturb ON: If you press the DND key to set the DND OFF status on the phone, the phone will send the DND OFF code to the 3CX server to Synchronize the DND status on the server side.
To activate DND in phone mode:
Press the DND soft key when the phone is idle. The icon on the status bar indicates that DND is enabled. Incoming calls will be rejected automatically and "n New Missed Call(s)" will prompt on the LCD screen.

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