Panasonic KX-TVM50 Installation Manual page 168

5.3 KX-TDA Series PBX Programming for Inband Integration
b)
Program the PBX so that unanswered calls to the ICD group are redirected to the VPS (ICD
Group Overflow feature).
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168 Installation Manual
Go to the "Groups-Incoming Call Distribution Group-Group Settings" screen.
Assign "Time out & Manual Queue Redirection-Destination" for the ICD group to a
floating extension number (VPS Port).
Assign "Overflow Time" parameter.
Click "Apply" to save the changed data.