Microsoft Teams Adds Secure Reliable Transport (SRT) Streaming for Town Halls and Live Events

Picture this. Your CEO is two minutes into the biggest town hall of the quarter. Ten thousand people are watching. And then the encoder hiccups.

The video stutters. Chat lights up. You can already feel the Slack messages coming.

If you run live events on Microsoft Teams, you know that feeling. You have probably lived it at least once. Microsoft just made a move that should make your shoulders drop a little.

Teams is officially adding Secure Reliable Transport (SRT) as a new inbound streaming protocol for town halls and live events, right next to the Real-Time Messaging Protocol (RTMP) you already use.

What Is SRT and Why It Matters for Teams Town Halls

Think of SRT as the protocol broadcast engineers have been quietly using for years to push great looking video across messy networks.

It is an open-source video streaming protocol built for one job. Deliver high quality, low latency video over the unpredictable public internet, even when the connection is far from perfect.

Compared with RTMP, here is what you actually get:

• Stronger resilience against packet loss, jitter, and unstable bandwidth
• AES 128 and AES 256 encryption for secure point to point contribution
• Lower glass to glass latency, even across long distances
• Better recovery during the kind of Wi Fi spikes you see in real corporate offices
• Wide adoption across professional encoders, hardware appliances, and cloud production platforms

What’s New in Microsoft Teams Live Events and Town Halls

Here is what actually shifts inside your Teams environment once SRT In is available for town halls and live events.

• You can use SRT as an alternative to RTMP for inbound external encoder streams
• You can configure a primary and backup SRT stream, with automatic failover if the primary feed drops
• Your existing RTMP workflows keep working exactly as they do today
• Your attendees see no difference; they join town halls and live events the same way
• A new admin policy control gates SRT In access at the tenant level

This applies to Teams for Windows desktop and Teams for Mac desktop and is tracked under Microsoft 365 Roadmap ID Link.

If you are responsible for live events in Microsoft 365, this is the kind of quiet update that genuinely upgrades your operational risk profile.

How SRT Failover Works Inside Teams Events

The piece that will matter most to you on event day is the dual stream failover model.

Here is the simple mental picture:

• A primary SRT stream comes in from your main encoder
• A backup SRT stream comes in from a secondary encoder or location
• Teams automatically fails over to the backup if the primary feed becomes unhealthy

Per Microsoft, SRT will be available alongside RTMP as an inbound protocol for Teams town halls and live events. Your existing encoder workflow stays intact and gains a more resilient option for the events that matter most.

Network and Encoder Readiness Checklist

Before you run your first SRT powered town hall, you will want a short, calm conversation with your network, IT, and AV partners.

Here is what you will want to line up.

Network and firewall

• Allow outbound access to port 49891
• Whitelist the domain .rtmpingest.mcr.teams.cloud.microsoft

Encoder readiness

• Confirm your hardware or software encoder supports SRT, in caller or listener mode as needed
• Document SRT settings in your runbook, including latency, encryption, passphrase, and stream ID
• Plan a secondary encoder so you can actually use the backup SRT stream

Treat SRT as a small, high leverage upgrade to a process you already trust, not a brand new system to learn from scratch.

Admin Policy: Enabling SRT-In in CsTeamsMeetingPolicy

Even though SRT In is widely available, you stay in control as the admin. Microsoft has added a specific policy gate just for this protocol.

To turn on SRT for your organizers, you need to explicitly add “SRT” to the AllowedStreamingMediaInput parameter inside CsTeamsMeetingPolicy.

Here is a clean checklist you can lift straight into your change ticket.

• Review which meeting policies are assigned to your event organizers
• Update AllowedStreamingMediaInput to allow SRT, alongside RTMP where you still need it
• Communicate the change to your event production, comms, and AV teams
• Add SRT to your internal Teams broadcasting documentation and onboarding playbooks

This is also a quiet but useful chance to tighten governance. Take a fresh look at who can stream into Teams town halls, from where, and with which protocols.

Who Should Care About This Update

This one is for you if your world includes any of the following.

• Quarterly all hands and CEO town halls with thousands of employees on the line
• Investor briefings, earnings calls, or regulated communications where a bad stream is a real business risk
• Hybrid conferences with multiple contribution feeds across cities or studios
• Customer facing webinars where brand perception sits inside the video player
• Internal training and certification events that depend on reliable attendance and recording

If you are a Microsoft 365 admin, a broadcast engineer, an AV partner, or an internal comms leader, SRT In is a real step toward broadcast grade Teams events instead of best effort ones.

Bottom Line for IT, AV, and Marketing Leaders

The arrival of SRT support in Microsoft Teams town halls and live events is bigger than a protocol tweak. It is a clear signal that Teams is positioning itself as a serious enterprise broadcasting platform, not just a meetings app with a town hall mode.

For you, the practical wins are very real.

• More reliable streaming for your most visible executive and external events
• Built in backup and failover, with no bolt on tools to babysit
• Stronger security on the contribution leg of your workflow
• Tighter admin control through meeting policies and governance

If you own Teams live events inside your organization, this is the right moment to audit your encoders, network paths, and runbooks. Plan a short SRT pilot before your next high visibility broadcast, and you will walk into event day with a lot more confidence and a lot fewer surprises.

Learn More: Official Microsoft References

Use these official Microsoft resources to review the latest guidance, policy controls, and roadmap details for managing external encoder workflows in Teams events.

• Manage RTMP-In for Teams meetings, webinars, and town halls, Microsoft Learn
• Set-CsTeamsMeetingPolicy | Microsoft Learn PowerShell reference
• Microsoft 365 Roadmap ID Link for rollout updates
• Produce a Microsoft Teams live event using an external encoder | Microsoft Support
• Custom Production Virtual Event Playbook | Microsoft Adoption