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Operation
User Manual 81
The alarm keeps ringing for thirty seconds. And it can be set by specified extensions.
If you receive an incoming call during ringback,
the ringing starts after the ringback
stops.
If you are having a conversation exceeding the specified time period,
the ringback will
start after your conversation.
When you go off-hook to answer, you can hear the alarm tone or the message which the
operator pre-set.