Cloud PBX with on-premises PSTN connectivity allows companies to leverage their existing Skype for Business Server infrastructure to home users in Skype for Business Online while using their local PSTN breakout.
Recently we received several questions around the requirements for Skype for Business Server versions. While this is documented on TechNet in Prerequisites for using Cloud PBX with on-premises PSTN connectivity, we want to use this article to highlight the requirements regarding server versions. Other requirements are not discussed in this blog article but can be found in the same TechNet article.
Please note that this blog article is specific to leverage Cloud PBX with on-premises PSTN connectivity. If you want to enable “just” hybrid without Cloud PBX, the requirements are not as strict. See TechNet Plan hybrid connectivity between Skype for Business Server and Skype for Business Online for more details.
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