AASTRA 4220 Lite for BusinessPhone User Guide EN - Manual (Page 11)

11 BusinessPhone – Dialog 4220 Lite / Dialog 3210
Description
Ô
Extinguished lamp The function is not active.
Х Ф
Steady light The function is active.
Ц Ф
Slowly flashing lamp The line (or function) is put on hold.
Ц Ф
Rapidly flashing lamp An incoming call or message waiting.
Х Ф
Light with short breaks Ongoing call.