Discover which Microsoft Teams client lacks support for the Survivable Branch Appliance (SBA) in Direct Routing deployments, ensuring continuity during network outages.
Table of Contents
Question
You have a Microsoft Teams Phone deployment that uses Direct Routing.
You have a branch office that contains a Session Border Controller (SBC).
You plan to deploy a Survivable Branch Appliance (SBA) to the branch office.
You need to identify which Teams clients will support the SBA.
Which Teams client is NOT supported?
Select only one answer.
A. Teams browser client
B. Teams client for macOS desktop
C. Teams client for Windows desktop
D. Teams for Mobile
E. Teams Phone
Answer
The Teams browser client (Option A) is not supported for use with the Survivable Branch Appliance (SBA) in Microsoft Teams Direct Routing deployments.
A. Teams browser client
Explanation
To use an SBA, you must have a valid Teams client. The SBA does not support the Teams browser client.
Key Details About Supported SBA Clients
The SBA ensures PSTN call continuity during network or cloud outages. According to Microsoft’s documentation and vendor resources:
Supported clients include:
- Teams client for Windows desktop
- Teams client for macOS desktop
- Teams-certified physical phones (e.g., Teams Phones).
Unsupported clients include:
- Teams browser client: Browser-based Teams lacks the necessary integration for SBA failover and media handling during outages.
- Teams for Mobile: While some third-party sources previously suggested mobile support, Microsoft’s 2025 documentation excludes mobile clients from the SBA’s supported list.
Why the Browser Client Is Unsupported
The SBA relies on local media bypass and direct signaling with the SBC during outages, which browser clients cannot reliably handle due to limitations in persistent connectivity and media processing. Desktop apps and Teams Phones, however, maintain direct communication with the SBA.
For exam purposes, Option A (Teams browser client) is the correct answer, as it is explicitly excluded from Microsoft’s official SBA compatibility list.
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