Panasonic KX-TVA594 Installation Manual page 142

5.3 KX-TDA and KX-TAW Series PBX Programming for Inband Integration
d)
Program the PBX so that it will direct intercepted calls to the VPS.
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142 Installation Manual
Go to the "Groups-VM (DTMF) Group-System Setting" screen.
Select "None", "Answer by Mailbox", or "AA" as the parameter for "Intercept Routing
to the VPS Sequence".
This parameter determines which DTMF command the PBX will send to the VPS in
order to select the desired service (AA, VM, Custom Service, etc.). If using a Custom
Service, select "None".
Click "Apply" to save the changed data.