----------------------------- **While I generate an answer, here are some sources that might be helpful**: * [Get Call]() * [Outbound Calls from Python]() * [Vapi Python SDK]() * [Set up your Server URL]() -----------------------------

### Answer The reasons for the calls not being fulfilled as you described are related to specific error conditions and a customer action: 1. **Pipeline-error-eleven-labs-voice-failed**: This signifies a failure in the Eleven Labs voice service, which could be due to various issues such as service downtime, configuration errors, or quota limits exceeded. It's recommended to check the service status and configurations for Eleven Labs voice service [(1)]() . 2. **Silence-timed-out**: This indicates that the call was ended due to a prolonged period of silence being detected. Even if the caller responded, it's possible the system didn't detect the speech. Adjusting silence detection settings or ensuring better audio quality might help in preventing this issue. 3. **Customer-ended-call (AI didn't respond for 15 seconds)**: This occurred because the AI did not respond within 15 seconds, leading the customer to end the call. This could be due to processing delays or errors in fetching or generating the AI's response. Monitoring system performance and optimizing response handling can help mitigate such situations. To prevent these issues, you might want to review and adjust your setup, especially around the voice service configurations, silence detection thresholds, and system performance optimizations. Additionally, ensuring fallback measures or error handling strategies are in place can help improve the user experience even when issues occur.