When the Exchange Servers receive the call they will use the information within the call and find out the extension of the user who did not answer the call.Įxchange will then try to locate if a Valid UM enabled user exists with that extension and if there is then exchange will take the Voice Mail.

The UM online SBC will receive the call and it will deduce the Exchange Tenant information from the Forwarding address and will send the call to the correct Exchange servers in the Back End The SBC will First Encrypt the call using the Certificate that is installed on the SBC and will then send the call to the Forwarding address (UM Online SBC) The SBC should be configured to send the call to the Forwarding Address that is obtained from the UM IP Gateway field in the O365 Portal The Phone system should be configured to send this call to the On Premise SBC (Session Border Controller). User A uses his PBX phone to call User B on his PBX phoneĬall then goes back to the PBX/Phone System and the Phone system has to decide what to do with this call. The Purpose of this Post is to provide some guidance to customers who use a PBX/IP-PBX based phone system and wish to Integrate it with Microsoft O365 Exchange UM Online for Voice mail.īelow is a High level Architecture of UM Online looks like for a Customer with a Single Site Integrated with O365 for UM through an ON Premise SBCĬall Flow for Voice Mail - How does it work Please check for details before investing further into this set up Microsoft has announced End of Support for Third party PBX system that used Exchange UM online.

First published on TECHNET on Apr 16, 2016

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