Mitel 4001 - Manual (Page 14)

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Messaging - Callback
To leave a Callback Message on a telephone when you hear busy or
ringback tone:
z
Press MESSAGE.
To respond to a Message Waiting condition on your telephone:
1. Lift the handset.
2. Press MESSAGE.
USING ADVANCED FEATURES
Account Codes
To use Forced Account Codes:
1. Lift the handset.
2. Dial the Account Code digits.
3. Press #.
To enter an Account Code during a call:
1. Press FLASH.
2. Dial **3.
3. Dial the Account Code digits.
4. Press #.
5. Press FLASH.