| 請勿干擾 Do-Not-Disturb |
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若用戶不想受來電騷擾，可選擇暫時不接聽來電，來電者會聽到線路繁忙訊號，而用戶只會聽到電話響聲一次，用以提示用戶正有新來電。與此同時，用戶仍可如常打出電話。
You can choose to use "Do-Not-Disturb" function if you would
like to be not disturbed at some moments. The caller will get the busy
tone. User will get a ring tone in order to remind user that there is
an incoming call. On the other hand, you can still make outgoing calls.
