How Does Direct Routing Choose Which SBC Gets a Call?

Your SBCs get added to a gateway list in Office 365. You can assign them a priority if you wish. When a priority is set, calls from Teams will attempt to be routed to the SBC with the highest priority if it is available.

If no priority is set, or the preferred SBC is unavailable, calls will be routed to the SBC in the list that last provided SIP OPTIONS to Microsoft.


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