Deploy Phone System in Office 365 with on-premises PSTN connectivity in Skype for Business Server 2015 or Lync Server 2013

Skype for Business Server 2015
 

Topic Last Modified: 2017-09-25

The following topics should be used to deploy Phone System in Office 365 with on-premises PSTN connectivity. To learn about planning your deployment, see Plan Phone System in Office 365 with on-premises PSTN connectivity in Skype for Business Server 2015 or Lync Server 2013.

Before moving your users to Skype for Business Online it is recommended that you enable your users on-premises in Skype for Business Server or Lync Server 2013 and then move them online. If users are already in Skype for Business Online then you do not need to move them back, see the special considerations section of Enable the users for Enterprise Voice on-premises. To learn more about Phone System in Office 365 including licensing and plans, see PSTN Calling plans for Skype for Business.

All users have to be created in Active Directory on-premises and synchronized to Office 365 using the supported version of Azure AD Connector. You cannot enable users for Phone System in Office 365 that were created directly in Azure AD. If you want to enable Phone System in Office 365 with on-premises PSTN connectivity for a user who was created in Azure AD, you'll need to create a new account for that user in your on-premises AD, configure the account on-premises, and then synchronize the account using a supported version of Azure AD Connector tool. See also, https://technet.microsoft.com/library/mt455217.aspx.

Enabling a user for Phone System in Office 365 with on-premises PSTN connectivity and then moving them to Skype for Business Online requires the following steps:

 
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