Reply by Matt Walton from Infoxchange on Monday, 28 November, 2016 - 10:42

To access this dial in functionality, (which I use and enjoy) you will need to purchase an e5 license for $13.40 a month for any user that requires the ability to create a meeting with a dial in number. This $13.40 also includes the full Office 2016 suite and some other functionality. As an eligible NFP there should be an option to add this in your Office 365 admin portal However external users can access Skype for Business meetings created on the E2 plan without the dial in functionality using the web plugin or Skype for Business, just not using a phone number. Hope that helps - feel free to email mwalton@infoxchange.org if you need any further assistance. Matt