Panasonic KX-TDE200 User Manual

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1.2 Making Calls
40
User Manual
1.2.4
When the Dialled Line is Busy or There is No Answer
 Reserving a Busy Line (Automatic Callback Busy)
You can set the telephone to receive callback ringing: 
when a dialled extension becomes idle.
when your desired outside line that is in use by another extension becomes idle.
You cannot set Automatic Callback Busy for a busy party outside of the PBX.
When you answer the callback ringing:
For an outside call: The line is seized.
For an intercom call: The called extension starts ringing automatically.
To set (for both extension and outside line)
To answer the callback ringing from an idle extension
PT/SLT/PS
While hearing a busy tone
Enter 6.
6
On-hook.
C.Tone 
Off-hook.
PT/SLT/PS
Talk.
While hearing a callback ringing
R.B.Tone