### Answer I don't have detailed information about the "Fallback Number" or "System Outage Mode" in the Reliability settings based on my available sources. What I can share about Retell AI's fallback and reliability features: General Fallback System Retell AI has a Seamless Fallback system that automatically reroutes TTS (text-to-speech) and LLM functions to alternate providers if a disruption occurs. [(1) ]() - **Voice Module Fallback**: If your TTS provider (e.g., ElevenLabs) becomes unavailable, Retell AI automatically falls back to a secondary voice provider. You can configure which provider to fallback on in the Security & Fallback Settings Menu. - **LLM Module Fallback**: If your LLM provider (e.g., OpenAI) becomes temporarily unavailable, Retell AI routes the conversation through a hosted backup model. Built-in Resilience Features TTS fallback and retries are automatically built in, and can be manually configured. LLM fallback and retries are also automatically built in. [(2) ]() For specific details about the "Fallback Number" setting and "System Outage Mode," I'd recommend checking the linked "Learn more" in your Reliability settings or reaching out via: - [Contact Sales]() - [GitHub]() Would you like me to provide a general answer based on typical fallback number implementations?

​ To learn more, see the sources I considered: [[1] How Retell AI Handles Outages with a 99.99% Uptime | Retell AI](https://www.retellai.com/blog/how-retell-ai-handles-outages-with-a-99-99-uptime) [[2] Reliability Overview](https://docs.retellai.com/reliability/reliability-overview) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.