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Allow or Prevent Calls Without a Caller ID to Leave a Voice Message

Applies to: Exchange Server 2010

Topic Last Modified: 2011-03-19

You can allow or prevent UM-enabled users to receive voice messages from anonymous callers or to prevent them from doing so. By default, when users are enabled for Unified Messaging (UM), they can receive calls that are anonymous and don't contain caller ID information.

In most cases, calls received by a Unified Messaging server contain a caller ID that can be used to determine the source of the incoming call. However, incoming calls may not include caller ID information for the following reasons:

  • Your organization's telephony equipment is configured not to include caller ID information.
  • The incoming call is from a mobile or external telephone.
  • Callers have disabled caller ID on their telephone.

Because the Allow diverted calls without a caller ID to leave a message option is enabled by default, a UM-enabled user can receive a voice message even if caller ID information isn't included. If the Allow diverted calls without a caller ID to leave a message option is disabled, and the UM-enabled user receives a call that doesn't include a caller ID, the call will be identified as anonymous, and the UM-enabled user won't receive a voice message.

Looking for other management tasks related to UM users? Check out Managing Unified Messaging Users.

You need to be assigned permissions before you can perform this procedure. To see what permissions you need, see the "UM mailboxes" entry in the Unified Messaging Permissions topic.

  1. In the console tree, click Recipient Configuration.
  2. In the result pane, select the user's mailbox.
  3. In the action pane, click Properties.
  4. On the Mailbox Features tab, click Unified Messaging, and then click Properties.
  5. On the Unified Messaging Properties page, do one of the following:
    • To enable voice messages from anonymous callers, select the Allow diverted calls without a caller ID to leave a message check box.
    • To disable voice messages from anonymous callers, clear the Allow diverted calls without a caller ID to leave a message check box.
  6. Click OK to accept your changes.

You need to be assigned permissions before you can perform this procedure. To see what permissions you need, see the "UM mailboxes" entry in the Unified Messaging Permissions topic.

This example allows UM-enabled users to receive voice mail from calls that don't contain caller ID information.

Set-UMMailbox -Identity tonysmith@contoso.com -AnonymousCallersCanLeaveMessages $True

This example prevents UM-enabled users from receiving voice mail from calls that don't contain caller ID information.

Set-UMMailbox -Identity tonysmith@contoso.com -AnonymousCallersCanLeaveMessages $False

For more information about syntax and parameters, see Set-UMMailbox.

After you enable or disable voice messages from anonymous callers for a UM-enabled user, you may also want to:

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