Yealink SIP-T22P User Manual page 117

User Guide SIP-T22P IP Phone
To enable MWI subscription via web user interface:
1. Click on Account->Advanced>>.
2. Select Enabled from the pull-down list of Subscribe for MWI field.
3. Enter the period time in the MWI Subscription Period (seconds) field.
4. Click Confirm to accept the change.
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