Aastra 6739I Installation Manual page 21

5. Push the clip in until it snaps into the slot flush with the surface and only
the legs on the clip are sticking up.
6. Place the handset into the phone's cradle, inserting the legs on the clip
into the square hole on the handset. This allows the handset to rest in
the cradle in a vertical position without slipping off when the phone is
installed on the wall.
Clip
Remove clip, turn 180
degrees, and reinsert
clip.
Model 6739i IP Phone Installation Guide 15
Square Hole
on Handset