Any such traceability questions fall under legal and regulatory processes outside the documented Teams configuration and behavior.

Dear @C B,

Good day, and thank you for reaching out to the Q&A Forum. From my research, in standard Microsoft Teams configuration, when a call is blocked (either by an individual user via Privacy settings or by tenant-level admin policies), the blocked call is typically rejected silently or routed to a resource account without notifying the caller. From the end-user perspective, blocked calls do not appear in the recipient’s call history or activity log.

Whether blocked calls are traceable at the administrative or compliance level depends on the organization’s Microsoft 365 licensing, configuration, and auditing settings. While blocked calls are usually not visible to regular users, certain call-related metadata or logs may still exist within administrative or compliance systems. Access to that information is typically limited to authorized administrators, compliance personnel, or formal legal processes.

When referring to “legal and regulatory processes,” this generally means situations involving compliance, auditing, eDiscovery, legal hold, internal investigations, or regulatory requirements that may apply to an organization or region. These processes are handled through Microsoft 365 compliance and auditing features rather than standard Teams end-user functionality.

As a forum moderator, I’m not able to access tenant-level audit systems or backend configurations to confirm exactly what logging or traceability capabilities may exist in a specific Microsoft 365 environment. Our role here is limited to providing general guidance based on Microsoft’s publicly available documentation and standard Teams behavior.

If you are an administrator or have compliance-related requirements, it may be helpful to review Microsoft Purview audit logging capabilities or consult your organization’s Microsoft 365 Global Administrator, compliance administrator, or IT/security team for more specific information about available reporting and retention settings.

For day-to-day management of blocked calls, you can refer to the Teams Privacy settings (Settings > Privacy > Blocked contacts) or tenant-wide inbound call blocking policies managed through PowerShell.

For reference, I also recommend reviewing the link provided by AI above, as it may provide additional useful context.

I hope this information helps clarify the situation. Should you have any further questions or need additional assistance, please don't hesitate to reach out. I'm always happy to help. Have a wonderful day! 

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