Panasonic KX-NS700 Operating Manual page 39

To set (for both extension and CO line)
PT/SLT/PS
While hearing a busy tone
6
C.Tone
Enter 6.
To answer the callback ringing from an idle extension
PT/SLT/PS
While hearing a callback ringing
R.B.Tone
Off-hook.
To answer the callback ringing from an idle CO line
PT/SLT/PS
While hearing a callback ringing
Off-hook.
•
If you do not answer the callback ringing within 10 seconds, this feature will be canceled.
Automatic Callback Busy Cancel
PT/SLT/PS
Off-hook.
Document Version 2014-11
On-hook.
Talk.
outside
phone no.
Dial outside
phone number.
4 6
C.Tone
Enter 46.
1.3.4 Automatic Callback Busy (Camp-on)
Talk.
On-hook.
Operating Manual 39