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APPLIES TO: 
Meetings Webinars 
Town halls
Important
Licensing update for Teams Premium and Teams Enterprise
As of April 1, 2026, some features that were previously only available with Teams Premium are now included with Teams Enterprise. Teams Premium continues to offer advanced meeting protection, advanced communication (like the Queues app), branding and personalization, and intelligence capabilities. Learn more.
Customers who purchased Teams Premium licenses before April 1, 2026 will continue to have access to all the previously included Teams Premium features and product experiences included with these licenses until they expire.
To manage Teams Premium features, your tenant must have at least one active Teams Premium license.
Note
This feature is currently being rolled out to Teams Enterprise and might not be available in your organization yet.
Microsoft Teams town hall attendees have historically viewed the presentation with a 30-second or more delay. With Ultra-Low Latency (ULL), attendees can now watch the town hall at a significantly reduced latency so they can be in sync with the presentation being shared and better engage with the organizers and presenters.
Ultra-Low Latency uses a new streaming protocol for town hall attendees. Ultra-Low Latency is compatible with the Microsoft Enterprise Content Delivery Network (eCDN). It doesn't support third-party eCDN providers.
All engagement and interactivity features—including reactions, event chat, and more—work regardless of what streaming protocol is used.
No action is required from administrators to enable Ultra-Low Latency in their organization.
Note
Ultra-Low Latency (ULL) might fall back to the HTTPS Live Streaming (HLS) protocol if Microsoft detects a network issue.
FAQ
Will it use the same town hall Content Delivery Networks?
No. Ultra-Low Latency operates its own delivery network within the Microsoft 365 domains and IPs.
Will Ultra-Low Latency work with Real-Time Messaging Protocol (RTMP)?
Yes, but there's additional inherent latency with the RTMP protocol that isn't reduced by Ultra-Low Latency.
What determines the location of Delivery Nodes and should we expect Ultra-Low Latency in locations such as China?
Delivery nodes are determined by the location of the attendee and located throughout NOAM, APAC, and EMEA. There are no delivery nodes specifically in China and this traffic would be served from APAC.
Will Ultra-Low Latency work with town halls that were scheduled before the rollout to my organization?
Yes, because Ultra-Low Latency usage is decided at runtime rather than during the scheduling process.
Can Ultra-Low Latency be enabled in meetings options during a town hall?
Ultra-Low Latency is used by default, and if clients have issues with ULL, there's a fallback to HTTPS Live Streaming (HLS).
Will Ultra-Low Latency scale to 50,000 and/or 100,000 attendees?
Ultra-Low Latency currently supports up to 20,000 users. We're working to scale this support to 50,000 and 100,000 in the future. For now, events exceeding 20,000 users use HTTPS Live Streaming (HLS) protocol.