When you use the Skype for Business or Lync Basic 2013 client, you discover that some Skype Voice features aren't available.
This is the expected behavior. You must use a client version that supports the advanced Skype Voice features. For more information about Skype for Business (formerly Lync) client feature comparisons, see the following Microsoft website:
This behavior occurs because the Skype for Business and Lync Basic 2013 clients don’t support the advanced Skype Voice features. For more information, see the following Microsoft website:
Article ID: 3134234 - Last Review: Dec 29, 2016 - Revision: 1