Alcatel IP1020P Administrator's Manual page 54

Note:
Please contact your system administrator for the access number. Different systems
have different codes.
To benefit from the MWI service in function of your system you may need to subscribe
to it. This setting can only be done using the web interface. Contact your system
administrator or your service provider for more details.
To configure Voicemail settings using the Web interface:
Go to SystemSip Account Management and set Voicemail access number
If needed scroll down in the same page and set Subscribe for MWI and MWI
Subscription period.
Then press Save button to store your settings.
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Alcatel IP1020 Administrator Guide ed1.0