Right now, the services are only available as a beta for businesses with a subscription to Office 365 enterprise or Skype for Business Plan 2, though Microsoft plans to roll them out more broadly later this year. The Cloud PBX and PSTN Conferencing features are currently only available to users in the U.S., while Skype Meeting broadcast can be used worldwide. Those businesses that want to take advantage of the new services can choose to deploy any number of them, as well.
Companies that rely on Skype for Business (or plan to) will be able to use Azure ExpressRoute for Office 365 later this year to get a direct connection from their business to Microsoft's servers, which should improve call quality for an additional cost.
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