Microsoft Teams: Copilot PSTN audio announcements

[Introduction]

Microsoft Teams includes audio announcements for PSTN (phone dial‑in) participants when Copilot is used in Copilot Only mode, which is Copilot without transcription. These announcements inform PSTN participants when their audio is being processed by Copilot during calls and meetings.

[When this will happen]

• General Availability (Worldwide and GCC): Rollout is complete.
• General Availability (GCCH and DoD): Rolling out in late June 2026.

[How this affects your organization]

Who is affected

• Organizations that use Copilot in Copilot Only mode
• PSTN participants in:
  • 1:1 PSTN calls
  • Group calls with PSTN participants
  • Meetings joined via Audio Conferencing (dial‑in)
  • Users connecting by “Call Me”

Copilot is accessible to users who are licensed for Microsoft 365 Copilot. This capability requires a Microsoft 365 Copilot license for the user who enables Copilot, but awareness is relevant for all tenants because PSTN participants may hear these announcements when joining calls hosted by organizations that use Copilot.

Teams desktop, web, and mobile clients are not affected.

What will happen

PSTN participants will now hear audio announcements when Copilot processes or stops processing their audio.

When Copilot Only mode starts:

• PSTN users hear a notification that Copilot is processing their audio.
• This plays when a PSTN participant joins a call with Copilot Only mode already enabled or when Copilot Only mode is turned on during a call.

When Copilot Only mode stops:

• PSTN users hear a notification that Copilot is no longer processing their audio.

Announcements follow the same localization behavior as existing recording or transcription announcements.

No new admin controls or tenant-level settings are added.

If your organization uses Copilot with transcription, no behavior changes occur, as the existing transcription announcement already communicates this information.

[What you can do to prepare]

No admin action is required. These announcements play automatically when PSTN participants are present and Copilot Only mode is active.

You may want to:

• Inform helpdesk and support teams about the new audio announcements.
• Update internal documentation related to audio conferencing and Copilot behavior.
• Notify users who frequently join meetings via phone that they may hear new audio prompts.

Learn more:

• Get started with Copilot in Microsoft Teams Phone | Copilot in Teams | Copilot | Microsoft Support
• Use Copilot in Microsoft Teams meetings | Copilot in Teams | Copilot | Microsoft Support

[Compliance considerations]

No compliance considerations identified. Review as appropriate for your organization.