Aastra Dialog 4420 IP Basic - When You Receive a Busy Tone

23Dialog 4420 IP Basic
Outgoing Calls
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.
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.
Callback if all lines are busy
If all external lines are busy (after dialing the digit or digits to get a
line):
6 Press
or
Ô Callback press.
z# Dial the external number and press.