You can choose to not receive incoming calls whilst still being able to use your extension to make calls. When enabled, callers are re-directed to your voicemail if on or otherwise hear busy tone.
You can also add a set of exception numbers for callers who are still be able to call you when you have do not disturb on.
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To switch do not disturb on: Dial *08.
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To switch it off: Dial *09.
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To add a number to the exception list: Dial *10*N# where N is the number. That can include external numbers.
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To delete a number from the exception list: Dial *11*N#.
