Yealink SIP VP-T49G User Manual page 285

The MWI subscription parameters you need to know:
Options
Subscribe for MWI
MWI Subscription Period
Subscribe MWI To Voice
Mail
Note The phone will send SUBSCRIBE messages for MWI service to the account or the voice number
MWI service depending on the server. Contact your system administrator for more information.
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 Enabled 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.
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.
Description
Enable or disable a subscription for MWI service.
Period of MWI subscription. The IP phone sends a refresh
SUBSCRIBE request before initial subscription expires.
Enable or disable a subscription to the voice mail number
for MWI service.
To use this feature, you should also configure the voice
mail number.
Advanced Phone Features
285