AASTRA 4420 IP Basic (SIP) for MX-ONE User Guide - Manual (Page 20)

Outgoing Calls
Dialog 4420 IP Basic 20
u
Lift the handset. *42#
Dial and wait for a new dial tone.
Press
z
Dial the number.
Instead of your name and number, the display on the called phone
shows
Anonymous .
When you receive a busy tone
If you call an extension and receive a busy tone, or get no answer,
or all external lines are busy, you can use any of the following
methods:
Callback
If a called extension is busy: 6
Press
or Ô
Callback press.
It can take several seconds before the procedure is executed.
A confirmation tone is heard.
Note: France, Finland and Sweden, press
5
d
Replace the handset to finish the procedure.
You are called back (recall ring signal) when the ongoing call is finished
or the next time a new call is finished. You have to answer within eight
seconds, otherwise the Callback service is cancelled. While waiting for
the Callback, you can make and receive calls as usual. u
Lift the handset when you are called back.
The system calls the extension.
Note: Callbacks can be activated on several extensions at
the same time.