According to your case description, you encountered a call merge problem when using Microsoft Teams. Teams does support a feature to merge incoming calls into existing calls, however, this feature should not be triggered automatically without user action. For more information, please refer to Merge calls in Microsoft Teams.
To avoid this, please try the following steps:
- Check Teams settings: Make sure that the option to automatically merge calls is not enabled in your Teams settings.
- Update Teams app: Make sure you are using the latest version of the Teams app.
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