AASTRA 4223 Professional for BusinessPhone User Guide - Manual (Page 23)

23 BusinessPhone — Dialog 4223 Professional / Dialog 3213
Outgoing Calls
Automatic Callback
You call an extension and receive busy tone or get no answer.
call-back
Press (see display).
Verification tone.
d
or
í
Replace the handset or press to finish the procedure.
You are called back if the extension finishes the ongoing call or the
next time the extension finishes a new call. You have to answer
within eight seconds otherwise the Callback service is cancelled.
u
Lift the handset when you are called back.
(You can also press the Line or Loudspeaker key to answer in
handsfree mode.)
12 May 10:35 +15°
BURNES BOBBY 201 BUSY
camp-on call-back intrusion