Mitel 1000 Owner's Manual page 163

Enter the System Programming Password and select 'Extensions'.
Select 'Examine passwords'
Select 'Ext. lock password'.
Select the extension. The Lock Password is briefly displayed on the
top line of the display.
Press the Speakerphone Key to finish programming.
Call Waiting Tone Protection
Extensions may present a busy extension with a Call Waiting tone,
provided the busy extension is not protected against receiving Call
Waiting tones. By default, all extensions are protected against
receiving Call Waiting tones. However, you may program
extensions to receive Call Waiting tones.
To program an extension to receive Call Waiting tones
From the Programming Extension, select the PROGRAM Key
Press the Scroll Down Key ( ) until 'System programming' is
displayed.
Select 'System programming'.
Enter the System Programming Password and select 'Extensions'.
Press the Scroll Down Key ( ) until 'Tone protection' is displayed.
Select the extensions you wish to allow receive Call Waiting tones.
A ◊ is displayed beside those extensions allowed to receive Call
Waiting tones, and a ♦ is displayed beside those extensions
protected against receiving Call Waiting tones. (By default, all
extensions will have a ♦ displayed).
Press the Speakerphone Key to finish programming.
To protect an individual call from Call Waiting tones
If your extension can receive Call Waiting tones, you may protect
each call on an individual basis from interruption.
When you are on a call, select 'Tone protect' on the display.
From a standard telephone, the code is Hookflash 725.
Barge-In
To Program extensions allowed to barge-in
In default no extensions are programmed to activate "Barge-In".
From the Programming extension, press the PROGRAM key.
Press the Scroll Down key ( ) until "System Programming" is
displayed.
Select "System Programming".
Enter the System Programming Password and select "Extensions".
Press the Scroll Down key ( ) until "Barge-In" is displayed.
Select "Barge-In Extensions".
Select the extensions that are to be allowed to barge-in. The
extensions you select will have a "♦" displayed beside them.
The default is that no extensions are allowed to barge-in.
To Program extensions protected from "Barge-In"
From the Programming extension, press the PROGRAM key.
Press the Scroll Down key ( ) until "System Programming" is
displayed.
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