Panasonic KX-TVS95 Installation Manual page 63

b)
Assignment of IRNA (Intercept Routing No Answer) destination:
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
Specify the FDN for the extension group to which VM or AA has been assigned.
Screen output:
3.3 CONNECTING THE VPS WITH PANASONIC KX-T SERIES PBXs
Installation Manual 63