Panasonic KX-TVA594 Installation Manual page 149

b)
If the VPS is only answering calls not answered by the operator (Operator Backup):
Go to the "3.CO-2.Incoming / Outgoing" screen. Program lines to ring operator extensions
immediately for all time modes. To give the operator (extension 101 in this example) time to
answer the call before the VPS picks up, we recommend setting the delay to a few seconds
for each extension connected to the VPS. Set a different delay time for each extension
connected to the VPS. Finally, go to the "3.CO-1.Line Mode" screen and set all trunk (CO
line) types to "Normal". Click "Apply" to save the changed data.
c)
If the VPS is only answering calls not answered by user extensions:
Go to the "3.CO-2.Incoming / Outgoing" screen. Program lines to ring user extensions
5.4 KX-TA824 PBX Programming for Inband Integration
Installation Manual 149