Update 9/12/2018: We have two important updates for customers:
As we prepare to discontinue support for PBX’s connecting to Exchange Online Unified Messaging, we will remove the ability for t...
Updated Jul 01, 2019
Version 2.0
Blog Post
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New date for discontinuation of support for Session Border Controllers in Exchange Online Unified Messaging
On a related note, check out my article explaining the voicemail options for Exchange Server and Skype for Business on-premises and for Office 365: http://www.expta.com/2018/07/say-bye-bye-to-exchange-unified.html