According to the Microsoft documentation3, you can use Endpoint Reports in the Microsoft Call Quality Dashboard (CQD) to identify whether Teams calls use TCP or UDP. Endpoint Reports show information about the devices and networks used in Teams calls and meetings, such as device name, manufacturer, model, OS version, network type, IP address, and transport protocol (TCP or UDP).
To access Endpoint Reports in CQD, you need to follow these steps3:
Sign in to CQD with your admin account.
In the left navigation pane, select Reports > Endpoint.
In the report list page, select one of the predefined endpoint reports, such as Endpoint by Manufacturer or Endpoint by Network Type.
In the report details page, you can see various metrics and filters for the selected report. You can also customize the report by adding or removing dimensions and measures.
To see whether Teams calls use TCP or UDP, you need to add Transport Protocol as a dimension to the report. To do this, select Add dimension, and then select Transport Protocol from the drop-down list.
The report will show the distribution of TCP and UDP usage for Teams calls based on the selected report type.