Microsoft Teams is updating UDP signaling ports for Calling and Meetings to enhance efficiency. The source ports will change from 49152-65535 to 50070-50089, with the destination UDP port remaining at 3478. Rollout begins early October 2024. Admins should allow the new UDP source ports to the specified destination ports.
Coming soon: To enhance the efficiency of Microsoft Teams, we will implement a significant update to the UDP signaling ports used for Calling and Meetings.
Before this rollout, Teams uses UDP Source Ports 49152-65535 for Calling and Meetings signaling API Calls. This includes functionality such as mute/unmute, hold, adding participants, and reactions.
After this rollout, Teams will transition UDP signaling from source ports 49152-65535 to 50070-50089, maintaining the destination UDP port 3478. This change aims to reduce the number of ports used and enable you to apply Quality of Service (QoS) DSCP markers to this traffic.
When this will happen: General Availability (Worldwide): We will begin rolling out early October 2024 and expect to complete by early October 2024.
What you need to do to prepare:
Allow UDP Source Ports 50070-50089 to Destination Ports 3478 to 52.112.0.0/14, 52.122.0.0/15, 2603:1063::/38 (ID 11, Optimized Category for Microsoft Teams). Since the new range is a smaller subset inside of the existing ranges, no changes should be required for admins currently allowing UDP signaling.
Learn more in the Microsoft Teams section of Microsoft 365 URLs and IP address ranges - Microsoft 365 Enterprise | Microsoft Learn