AASTRA 4425 IP Vision (SIP) for MX-ONE User Guide - Manual (Page 11)

Description
Dialog 4425 IP Vision 12
Lamp indications
Ô
Extinguished lamp The feature is not active.
Х Ф
Steady light
The feature is active or the multiple
represented line is busy.
Ц Ф
Slowly flashing lamp The line (or feature) is put on hold.
Ц Ф
Rapidly flashing lamp An incoming call.
Х Ф
Light with short breaks Ongoing call.