Yealink SIP-T54S Administrator's Manual page 697

Parameters
Web User Interface:
Account->Advanced->Voice Mail Display
Phone User Interface:
None
To configure subscribe for MWI via web user interface:
Click on Account->Advanced.
1.
Select the desired account from the pull-down list of Account.
2.
Select the desired value from the pull-down list of Subscribe for MWI.
3.
Enter the period time in the MWI Subscription Period(Seconds) field.
4.
Click Confirm to accept the change.
5.
To configure 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 the desired value from the pull-down list of Subscribe MWI To Voice Mail.
4.
Configuring Advanced Features
Permitted Values Default
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