Aastra Dialog 4420 IP Basic User Manual page 25

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CallWaiting
Dialog 4420 IP Basic
Activate Call Waiting
If you urgently wish to contact a busy extension or external line, you
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can notify by a Call Waiting signal.
Press.
or
press.
Keep handset off hook. When the called extension or the external
line becomes free, it will be called automatically.
Note: The Call Waiting feature might be blocked for use on
your extension (programmed by your system
administrator). If Call Waiting is not allowed, you will
continue to receive a busy tone.
Outgoing Calls
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