Configure Exchange Server Unified Messaging for Skype for Business Server 2015 voice mail

Summary: Configure Exchange Server Unified Messaging for Skype for Business Server voice mail.

Skype for Business Server 2015 enables you to have voicemail messages stored in Exchange Server 2016 or Exchange Server 2013; those voicemail messages will then appear as email messages in your users' Inboxes.

If you have already configured server-to-server authentication between Skype for Business Server 2015 and Exchange Server 2016 or Exchange Server 2013, then you are ready to setup unified messaging. To do so, you must first create and assign a new unified messaging dial plan on your Exchange Server. For example, these two commands (run from within the Exchange Management Shell) configure a new 3-digit dial plan for Exchange:

New-UMDialPlan -Name "RedmondDialPlan" -VoIPSecurity "Secured" -NumberOfDigitsInExtension 3 -URIType "SipName" -CountryOrRegionCode 1
Set-UMDialPlan "RedmondDialPlan" -ConfiguredInCountryOrRegionGroups "Anywhere,*,*,*" -AllowedInCountryOrRegionGroups "Anywhere"

In the first command in the example, the VoIPSecurity parameter, and the parameter value "Secured" indicate that the signaling channel is encrypted by using Transport Layer Security (TLS). The URIType "SipName" indicates that messages will be sent and received using the SIP protocol, and the CountryOrRegionCode of 1 indicates that the dial plan applies to the US.

In the second command, the parameter value passed to the ConfiguredInCountryOrRegionGroups parameter specifies the in-country groups that can be used with this dial plan. The parameter value "Anywhere,*,*,*" sets the following:

  • Group name ("Anywhere")

  • AllowedNumberString (*, a wildcard character indicating that any number string is allowed)

  • DialNumberString (*, a wildcard character indicating that any dialed number is allowed)

  • TextComment (*, a wildcard character indicating that any text command is allowed)


Creating a new dial plan will also create a Default Mailbox Policy.

After creating and configuring the new dial plan you must add the new dial plan to your unified messaging server and then modify the startup mode of that server; in particular, you must set the startup mode to "Dual". You can perform both of these tasks from within the Exchange Management Shell:

Set-UmService -Identity "" -DialPlans "RedmondDialPlan" -UMStartupMode "Dual"

After the unified messaging server has been configured you should next run the Enable-ExchangeCertificate cmdlet to ensure that your Exchange certificate is applied to the unified messaging service:

Enable-ExchangeCertificate -Server "" -Thumbprint "EA5A332496CC05DA69B75B66111C0F78A110D22d" -Services "SMTP","IIS","UM"

After the certificate has been correctly assigned you must then stop and restart the MsExchangeUM service on the unified messaging server. This service must be stopped and restarted any time you change the startup mode.

After finishing configuration of the unified messaging server you can then configure the UM Call Router:

Set-UMCallRouterSettings -Server "" -UMStartupMode "Dual" -DialPlans "RedmondDialPlan" 
Enable-ExchangeCertificate -Server "" -Thumbprint "45BAA32496CC891169B75B9811320F78A1075DDA" -Services "IIS","UMCallRouter"

Because the startup mode has changed you must stop and restart the MsExchangeUMCR service on the computer hosting the UM Call Router.

To complete the unified messaging setup, you then need to create a UM mailbox policy and then use that policy to enable users for unified messaging. You can create a mailbox policy by using a command similar to this:

New-UMMailboxPolicy -Name "RedmondMailboxPolicy" -AllowedInCountryOrRegionGroups "Anywhere"

And you can enable a user for unified messaging by using a command similar to this:

Enable-UMMailbox -Extensions 100 -SIPResourceIdentifier "" -Identity "litwareinc\kenmyer" -UMMailboxPolicy "RedmondMailboxPolicy"

In the preceding command, the Extensions parameter represents the telephone extension number for the user. In this example, the user has the extension number 100.

After you have enabled his mailbox, the user should be able to use Exchange unified messaging. You can verify that the user can connect to Exchange UM by running the Test-CsExUMConnectivity cmdlet from within the Skype for Business Server Management Shell:

$credential = Get-Credential "litwareinc\kenmyer"

Test-CsExUMConnectivity -TargetFqdn "" -UserSipAddress "" -UserCredential $credential

If you have a second user who has been enabled for unified messaging you can use the Test-CsExUMVoiceMail cmdlet to verify that this second user can leave a voicemail message for the first user.

$credential = Get-Credential "litwareinc\pilar"

Test-CsExUMVoiceMail -TargetFqdn "" -ReceiverSipAddress "" -SenderSipAddress "" -SenderCredential $credential