@Craig Richards It sounds like you might be encountering an issue with a concurrency limit, which typically refers to the number of simultaneous operations or processes that can run within a system. Since you're developing assistants and testing them on two phone numbers, it's possible that you've hit a limit set by the Voice API platform for simultaneous calls or sessions. To resolve this issue, you can try the following steps: 1. **Check the Documentation**: Review the Voice API documentation to understand the concurrency limits that apply to your account or service tier. 2. **Review Your Code**: Ensure that your code is not unintentionally creating multiple sessions or calls that exceed the concurrency limit. 3. **Account Configuration**: Check your account configuration to see if there's an option to view or adjust the concurrency limits. 4. **Contact Support**: If you're still unsure about the concurrency limit or how to adjust it, it's best to reach out to the Voice API support team for assistance. 5. **Optimize Usage**: If you're close to the limit, consider optimizing your testing strategy to stagger calls or reduce the number of simultaneous sessions. If you need further assistance or have specific questions about your Voice API setup, please let me know, and I'll do my best to help you out!

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Concurrency limit is number of simultaneous calls you can make at your account level which includes both inbound and outbound.