User accounts in a hybrid environment with PSTN connectivity

About the environment

This article applies to environments in which you have all of the following:

  • Skype for Business Server or Lync Server 2013
  • An Office 365 tenant
  • Hybrid connectivity configured between the Skype for Business Server and Skype for Business Online or Microsoft Teams tenant
  • Users who are enabled to make and receive Public Switched Telephone Network (PSTN) calls to and from the client

If you have a different environment (such as Skype for Business Cloud Connector Edition), hybrid is not configured, or your users will not be enabled for PSTN calls, the supportability matrix will be different. 

About the combinations and the supportability statement 

A Skype for Business hybrid environment with PSTN connectivity provides flexibility regarding where user services are provided and how user accounts are provisioned and managed. But the abundance of options might create some unsupported combinations. This section explains different combinations of user creation, followed by a supportability statement.

Definitions:

  • Enterprise Voice: Option to provide access to PSTN for users with on-premises Skype for Business user account. On-premises Skype for Business Mediation server provides interconnectivity to PSTN.
  • Hybrid Voice Connectivity: Option to provide access to PSTN for with online Skype for Business account. On-premises Skype for Business Mediation server provides interconnectivity to PSTN.
  • Direct routing: Option to provide access to PSTN for users with online Skype for Business account, Microsoft Teams license, using Microsoft Teams client. The SBC is connected to the SIP Proxy in Office 365 without need for any on-premises software from Microsoft.

The environment supports the following combinations:

  • Scenario 1: User account in Skype for Business on premises and will use the Skype for Business client with Enterprise Voice
  • Scenario 2: User account in Skype for business online and will use the Skype for Business client with Hybrid Voice Connectivity
  • Scenario 3: User account in Skype for Business online with Microsoft Teams license and will use Teams client

Supportability matrix

User object created in User’s Skype for Business service provider User’s Client Voice option Supported
On premises AD On premises Skype for Business  Enterprise Voice  Yes
On premises AD Online Skype for Business  Hybrid Voice Connectivity  Yes
On premises AD Online Microsoft Teams Direct Routing  Yes
Unsupported combinations
Azure AD On premises/online Skype for Business/Microsoft Teams Enterprise Voice/Hybrid Voice Connectivity/Direct Routing  No, user object MUST be created in on-premises AD first 
On premises AD On premises Microsoft Teams Enterprise Voice/Hybrid Voice Connectivity/Direct Routing  No, Microsoft Teams client is not supported with on-premises Skype for Business
On premises AD Online Skype for Business  Direct Routing  No, Skype for Business client is not supported with Direct Routing 
On premises AD Online Skype for Business  Direct Routing  No, Direct Routing is not supported with Skype for Business client, and user must be enabled for Enterprise Voice in Skype for Business first 

Supportability statement for the hybrid environment with PSTN

For all users, the user object must be created in the on-premises AD and synchronized to the Azure AD using the Azure AD Connect tool. Enabling users for Teams/Skype for Business is not supported if the user object is created directly in the Azure AD in a hybrid configuration. For new users, such as a new hire, who will be enabled directly for Teams, the user must be enabled for Skype for Business using on premise Skype for Business management tools. Creating users in online Skype for Business or Teams without first enabling them in on-premises pool with Enterprise Voice is not supported. Please see this article for more details on how to enable users for Skype for Business in hybrid configuration.