The Office 365 telecommunication system can be operated as an integral solution (“Phone System”, formerly Cloud PBX) or in a hybrid environment (“Audio Conferencing”, formerly PSTN Conferencing), and therefore in connection with your current telephone systems or other telephone providers. The hybrid Audio Conferencing solution lets companies work with an on-premises PSTN connection, whereby Office 365 creates a cloud connection to the current telephone system or an installed PSTN gateway. This solution is particularly suitable if companies want to continue using their current telephone infrastructure. Users are hosted in Office 365, and Skype for Business is launched from the desktop to place calls.
“Phone System” gives companies wanting to replace their former telephone infrastructure a voice system hosted in Office 365. The benefit: All familiar PBX functions are available, but without the complicated and expensive equipment.
The Phone System and Audio Conferencing applications are available to you as part of an Office 365 Enterprise E5 subscription, but can also be booked as add-ons to other licensing models.