Panasonic KX-TVM50 Installation Manual page 186

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)
2)
3)
186 Installation Manual
Go to the "2-4 System Timer 1/2" screen.
Assign "Intercept Time" parameter.
Click "Apply" to save the changed data.