Microsoft Teams Adds Brand Impersonation Warnings for VoIP Calls

Microsoft is rolling out Brand Impersonation Protection for Microsoft Teams Calling to warn users about potentially fraudulent external VoIP callers attempting to impersonate trusted organizations. The feature evaluates first-contact external calls for impersonation risk signals and, when a call is deemed high-risk, displays warnings before the user answers; warnings can also persist during the call if suspicious indicators remain. Users can then choose to accept, block, or end the call to reduce exposure to social engineering and vishing attempts.

Deployment is expected to begin in the Targeted Release ring in mid-February 2026 and will be enabled by default for Teams Calling tenants, with broader availability timing to be communicated later. Microsoft indicates no administrative changes are required to enable the capability, but recommends preparing helpdesk/support teams for user questions and updating internal awareness/training materials to reflect the new high-risk call alerts; support is noted for Windows desktop and macOS clients.