AASTRA DT4x2 for MD Evolution User Guide EN - Manual (Page 76)

Voice Mail Services
MD Evolution – Cordless DT412 / DT422 / DT432 76
For Call Forwarding to your Voice Mailbox when your extension is
idle: å
Dial the prefix that corresponds to the desired type of call
forward.
Usually, you will dial one of the following: 61
To activate an immediate call forward. 62
To activate a call forward on no-answer condition. 63
To activate a call forward on busy condition 69
To activate a call forward on no-answer condition and busy
condition.
å
Dial 884
This is the usual access number for a system's integrated voice
mail system. If you need more information, contact your system
administrator. æ
Press to activate the service.
Wait for the Service Acceptance Tone æ
Press to finish the procedure