Yealink SIP-T42G - Manual (Page 124)

User Guide for the SIP-T42G IP Phone
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To enable Subscribe MWI to Voice Mail via web user interface:
1. Click on Account.
2. Select the desired account from the pull-down list of Account.
3. Click on Advanced.
4. Select Enabled from the pull-down list of Subscribe MWI To Voice Mail.
5. Enter the desired voice mail number in the Voice Mail field.
6. Click Confirm to accept the change.
The IP phone will subscribe to the voice mail number for MWI service using
Subscribe MWI to Voice Mail.
Note MWI subscription is configurable via web user interface only.