Panasonic KX-TVA594 Installation Manual page 162

5.6 KX-TD500 PBX Programming for Inband Integration
c)
Program the amount of time that passes before unanswered calls are redirected to the VPS
(Intercept Routing No Answer timer).
1)
Go to the "2-4 System Timer 1/2" screen.
2)
Assign "Intercept Time" parameter.
3)
Click "Apply" to save the changed data.
162 Installation Manual