Yealink SIP-T48G User Manual page 260

User Guide for the SIP-T48G IP Phone
Enter the period time in the MWI Subscription Period(Seconds) field.
4.
Click Confirm to accept the change.
5.
The IP phone will subscribe to the account number for MWI service by default.
To enable subscribe MWI to voice mail via web user interface:
Click on Account->Advanced.
1.
Select the desired account from the pull-down list of Account.
2.
Select Enabled from the pull-down list of Subscribe for MWI.
3.
Select Enabled from the pull-down list of Subscribe MWI To Voice Mail.
4.
Enter the desired voice mail number in the Voice Mail field.
5.
Click Confirm to accept the change.
6.
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