Yealink SIP-T22 - Manual (Page 128)

User Guide SIP-T22P/SIP-T22 IP Phone
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5. Enter the period time in the MWI Subscription Period (Seconds) field.
6. Click Confirm to accept the change.
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.