@Matilda
Thank you for providing the error details. The "Over Concurrency Limit" error with a 400 Bad Request status code indicates that you are exceeding the maximum number of concurrent calls allowed by your current Voice API plan.
To resolve this issue, you can consider the following options:
1. **Review Current Usage**: Check your application to ensure that it's not making more simultaneous calls than your plan permits. Look for any loops or concurrent processes that might be initiating more calls than expected.
2. **Upgrade Your Plan**: If your usage legitimately requires more concurrency, you might need to upgrade your Voice API plan to accommodate the higher concurrency needs.
3. **Implement Queueing**: If upgrading is not an immediate option, you can implement a queueing mechanism in your application. This will manage the calls and ensure that they are initiated within the concurrency limits.
4. **Error Handling**: Improve error handling in your application to catch this specific error and retry the call after a delay, ensuring that you stay within the concurrency limits.
If you need further assistance with reviewing your current usage or exploring plan upgrades, please let me know, and I can guide you through the next steps. If you're ready to close this support ticket, just let me know, and I'll proceed with that as well.