How to create an audio calling bot for the Marketplace?

Here’s a clear summary of the current (January 2026) best-practice approach for building an audio calling bot for Teams Marketplace that can be installed in multiple customer tenants:

1. Frameworks & Tools to Use

• Microsoft Bot Framework SDK
  • Still supported for Teams bots, including calling/meeting bots.
  • Use Bot Framework v4 with Node.js or C#.
• Microsoft Graph Communications API
  • Use Microsoft Graph Comms SDK for call control, media access, and signaling.
  • Required permissions: Calls.AccessMedia.All, Calls.Initiate.All, Calls.JoinGroupCall.All, etc.
• Azure Bot Service
  • Host your bot in Azure Bot Service for scalability and compliance.
• Teams App Manifest
  • Package your bot as a Teams app using the Teams App Manifest schema.
  • Specify bot endpoints, permissions, and capabilities.

2. Multi-Tenant Support

• Bot Framework bots can be made multi-tenant by registering as a multi-tenant Azure AD app.
• In your Azure AD app registration:
  • Set “Supported account types” to “Accounts in any organizational directory (Any Azure AD directory - Multitenant)”.
  • Grant required Graph permissions (Calls.AccessMedia.All, etc.) as application permissions.
• When publishing to Teams Marketplace, your app must be multi-tenant and consentable by customer admins.

3. Packaging for Teams Marketplace

• App Manifest:
  • Include your bot’s Azure AD app ID, endpoints, and required permissions.
  • List the bot in the bots section of the manifest.
  • Specify webApplicationInfo for SSO if needed.
• Permissions:
  • Teams app manifest does not directly grant Graph permissions; those are handled via Azure AD app registration.
  • Customers must grant admin consent for Graph permissions after installing your app.
• Marketplace Submission:
  • Follow Microsoft Teams Store submission guidelines.
  • Ensure your app passes validation for multi-tenant use and permissions.

4. Limitations & Notes

• Microsoft 365 Agents SDK is not GA until at least March 2026; do not use for production Marketplace bots yet.
• Graph Comms SDK is still the standard for calling bots.
• Azure Communication Services Call Automation does not support direct bot-to-Teams user calling for Marketplace bots as of now.
• App Manifest permissions: Only Azure AD app registration controls Graph permissions, not the Teams manifest.