The Teams PSTN (Public Switched Telephone Network) and SMS usage report in the Microsoft Teams admin center gives you an overview of calling and audio conferencing activity in your organization. You can view detailed calling activity for Direct Routing.
1.In the left navigation of the Microsoft Teams admin center, click Analytics & reports > Usage reports. On the View reports tab, under Report, select PSTN and SMS (preview) usage.
2.Under Date range, select a predefined range of 7 or 28 days, or set a custom range, and then select Run report.
The Direct Routing tab shows you information including the SIP address and call start and end times. Use the information in this report to gain insight into PSTN usage in your organization and help you to investigate, plan, and make business decisions.
For more details, please refer to Microsoft Teams PSTN usage report
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