Panasonic hybrid ip-pbx kx-tda200 User Manual

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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.