Panasonic KX-TVA594 Installation Manual page 158

5.6 KX-TD500 PBX Programming for Inband Integration
b)
Program the PBX so that unanswered calls to the operator are redirected to the VPS (Intercept
Routing No Answer feature).
1)
Go to the "3-1 Trunk Group" screen.
2)
Assign "Intercept Destination Day/Night" for the trunk (CO line) group.
3)
Click "Apply" to save the changed data.
Note
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158 Installation Manual
Specify the FDN for the extension group to which VM or AA has been assigned.