AASTRA 4220 Lite for BusinessPhone User Guide EN - Manual (Page 89)

89 BusinessPhone – Dialog 4220 Lite / Dialog 3210
Installation
Dialog 3210 Basic
Install cables
1 Cable to handset
2 Cable to exchange
3 Space for personal directory list (optional)
4 Wall mounting screw holes
You can put the cable to the handset in any of the two notches
underneath the telephone. The cable to the exchange has to be
plugged in LINE.
Change cables
To remove a cable, push down the plug stop. Use a screwdriver to
unlock the stop.