Enable Message Waiting Indicator (MWI) for users in Exchange Server
Applies to: Exchange Server 2013, Exchange Server 2016
You can enable or disable Message Waiting Indicator for users associated with a Unified Messaging (UM) mailbox policy. Message Waiting Indicator is a feature found in most legacy voice mail systems. In its most common form, it lights a lamp on a voice mail subscriber's phone to indicate the presence of a new voice mail message. Message Waiting Indicator can also send a text message to a UM-enabled user's mobile phone. The default setting is enabled.
If Message Waiting Indicator is disabled on the UM IP gateway, the feature isn't available to UM-enabled users associated with the UM mailbox policy.
For additional management tasks related to UM mailbox policies, see UM mailbox policy procedures.
What do you need to know before you begin?
Estimated time to complete: Less than 1 minute.
You need to be assigned permissions before you can perform this procedure or procedures. To see what permissions you need, see the "UM mailbox policies" entry in the Unified Messaging permissions topic.
Before you perform these procedures, confirm that a UM dial plan has been created. For detailed steps, see Create a UM dial plan.
Before you perform these procedures, confirm that a UM mailbox policy has been created. For detailed steps, see Create a UM mailbox policy.
For information about keyboard shortcuts that may apply to the procedures in this topic, see Keyboard shortcuts for the Exchange admin center in Exchange 2013.
Tip
Having problems? Ask for help in the Exchange forums. Visit the forums at Exchange Server.
Use the EAC to enable Message Waiting Indicator
In the EAC, navigate to Unified Messaging > UM dial plans. In the list view, select the UM dial plan you want to change, and then click Edit
.Under UM Mailbox Policies, select the UM mailbox policy you want to manage, and then click Edit
.On the UM Mailbox Policy page, select the check box next to Allow Message Waiting Indicator.
Click Save.
Use the Shell to enable Message Waiting Indicator
This example enables Message Waiting Indicator for users associated with the UM mailbox policy named MyUMMailboxPolicy.
Set-UMMailboxPolicy -identity MyUMMailboxPolicy -AllowMessageWaitingIndicator $true