Panasonic KX-TVM50 Installation Manual page 146

4.9 KX-TA, KX-TD, and KX-TE Series PBX Feature Programming for APT/DPT Integration
4.
Click the Key Number to which a button will be assigned.
"Flexible CO Key" screen displays.
5.
Select the desired Key Type. When 2WAY-REC, 2WAY-TRN, or VTR is selected, enter the
extension number in "DN".
146 Installation Manual