AASTRA DT4x2 for BusinessPhone User Guide EN - Manual (Page 116)

Reference
BusinessPhone – Cordless DT412/DT422/DT432 116
Phone signals
The Cordless phone signal certain events audibly and visually as
described below.
The Cordless phone also generates audible ring signals and alarm
signals.
Signal Meaning
Red warning light Incoming call.
Message waiting.
Sound Meaning
Ring signal Incoming call.
Alarm signal 1 short beep: Cordless phone out of range of
base system.
Message beep: Incoming message.
No-movement alarm or Man-down alarm
about to be sent (Cordless DT422 and DT432
only)
Key beep You hear this each time you press a key (when
selected).