Adds note on enterprise voice enablement for Teams user calling

Author: jamescadd

articles/communication-services/concepts/interop/enable-interoperability-teams.md

@@ -15,6 +15,8 @@ ms.custom: mode-other, devx-track-js
 
 The Azure Communication Services SDKs can be used to build applications that enable bring your own identity (BYOI) users to participate in calls and meetings with Microsoft Teams users. [Standard Azure Communication Services pricing](https://azure.microsoft.com/pricing/details/communication-services/) applies to these users, but there's no extra fee for the interoperability capability.
 
+For calls with Teams users, ensure the user is Enterprise Voice enabled. To assign the license, use the [Set-CsPhoneNumberAssignment cmdlet](/powershell/module/teams/set-csphonenumberassignment) and set the **EnterpriseVoiceEnabled** paramter to $true. For additional information see [Set up Teams Phone in your organization](/microsoftteams/setting-up-your-phone-system).
+
 Follow these steps to enable the connection between a Teams tenant and a Communication Services resource.
 
 [!INCLUDE [Enable interoperability in your Teams tenant](../includes/enable-interoperability-for-teams-tenant.md)]