Updated September 22, 2026: We have updated the timeline. Thank you for your patience.
[What and Why:]
Microsoft is enhancing Microsoft Teams call delegation with new controls that provide greater privacy, transparency, and control during active calls. Delegators will be able to lock active calls to prevent delegate participation and optionally enable warning tones that notify participants whenever a delegate joins or resumes a call. These enhancements help users manage sensitive conversations more effectively while improving awareness during delegated call handling.
This message is associated with Roadmap ID 567306.
[Rollout Schedule:]
- Targeted Release (Worldwide): We will begin rolling out in early August 2026 and expect to complete by mid-August 2026.
- General Availability (Worldwide): We will begin rolling out in mid-August 2026 and expect to complete by mid-August 2026.
- General Availability (GCC, GCC High): We will begin rolling out in mid-August 2026 and expect to complete by late August 2026.
- General Availability (DoD): We will begin rolling out in mid-August 2026 and expect to complete by end of October 2026 (previously mid-September).
[Impact on Your Organization:]
Who is affected:
- Users with Microsoft Teams call delegation configured.
- Executives, administrative assistants, managers, and support personnel who use delegated calling.
Platforms/Services:
- Microsoft Teams
- Teams Calling
- Teams desktop
- Teams web
What will happen:
- A new Lock an Ongoing Call capability will be available to delegators.
- Delegators can lock an active call to prevent delegates from:
- Resuming a call that has been placed on hold.
- Joining an ongoing active call.
- Delegates will continue to see locked calls in their call history.
- Delegates will be unable to participate in locked calls until the delegator unlocks the call.
- A new optional Warning Tone for Delegate Participation setting will be available.
- When enabled, all call participants will hear an audible notification when a delegate:
- Joins an active call.
- Resumes a held call.
- The feature increases transparency regarding delegate participation in live calls.
- This change will be available by default to users with call delegation configured.
- No existing call delegation workflows are removed.
Screenshot 1: During an active call, delegators can use the new Lock call control from the meeting toolbar to restrict delegate participation in sensitive conversations:
Screenshot 2: Delegators can lock an active Teams call directly from the Calls experience, preventing delegates from joining or resuming the call until it is unlocked:
Screenshot 3: New call delegation settings allow users to enable an audible notification that alerts participants whenever a delegate joins or resumes a delegated call:
[Action Required/Recommendations:]
No immediate administrative action is required.
Recommended actions:
- Review how call delegation is used within your organization.
- Inform users who utilize delegated calling about the new lock and notification capabilities.
- Update internal Teams calling documentation and training materials.
- Notify help desk and support teams of the new user experience to prepare for potential questions.
- Evaluate whether the delegate participation warning tone should be recommended for users handling confidential or sensitive conversations.
- Monitor Microsoft's official documentation for feature configuration details as rollout approaches.
Learn more: Share a phone line with a delegate in Microsoft Teams | Microsoft Support (will be updated for GA rollout)
[Compliance Considerations:]
| Compliance Question | Explanation |
| Does the change provide a new way of communicating between users, tenants, or subscriptions? | The feature introduces new delegated calling controls that affect how delegates can participate in ongoing calls. It also adds an optional audible notification that informs all call participants when a delegate joins or resumes a delegated call, increasing transparency during communications. |
| Does the change allow a user to enable and disable the feature themselves? | Delegators can lock and unlock ongoing calls and can enable or disable the warning tone notification setting for delegate participation. |