Yealink SIP-T20 - Manual (Page 106)

User Guide for the SIP-T20P/SIP-T20 IP Phone
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Option Description
subscribe for MWI and the voice mail number in advance.
Note
To enable MWI subscription 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 for MWI.
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.
Whether the phone sends SUBSCRIBE messages for MWI service to the account or the
voice mail number depends on the server. Contact your system administrator for more
information.