Aastra DT412 User Manual page 76

Voice Mail Services
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For Call Forwarding to your Voice Mailbox when your extension is
idle:
Dial the prefix that corresponds to the desired type of call
forward.
61
Usually, you will dial one of the following:
62
To activate an immediate call forward.
63
To activate a call forward on no-answer condition.
69
To activate a call forward on busy condition
To activate a call forward on no-answer condition and busy
condition.
Dial 884
This is the usual access number for a system's integrated voice
mail system. If you need more information, contact your system
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administrator.
Press to activate the service.
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Wait for the Service Acceptance Tone
Press to finish the procedure
MD Evolution – Cordless DT412 / DT422 / DT432