### Answer # SOP & Best Practices for Creating Retell AI Conversational Agents ## Conversational Design Fundamentals Good conversational design leads to higher resolution rates, shorter call times, reduced customer frustration, and brand-aligned voice experiences. [(1) ]() Key elements to implement: - Clear Entry Points – Define how conversations begin, setting tone and expectations immediately - Intent Clarity – Help users articulate needs naturally without feeling constrained - Guided Prompts – Offer helpful options without sounding overly scripted or robotic - Context Handling – Maintain memory across turns so conversations don't feel like starting over at every step - Graceful Error Recovery – Handle misunderstandings smoothly without frustrating the caller - Personalization – Tailor conversations based on user history, preferences, and real-time data --- ## Opening Greeting Best Practices Problem: Agents may generate both sides of the conversation or repeat greetings, especially on speakerphone. [(2) ]() Solution: Create a dedicated greeting node with interruption sensitivity set to 0 or block interruptions for that node, then transition to your main menu node. --- ## Multilingual Agent Tips When using Conversation Flow with multilingual support, the language may revert to English after node transitions. [(3) ]() Recommended approach: 1. Extract

{{user_language}}

after the first node 2. Add this instruction at the top of every subsequent node: > "Always speak in {{user_language}} throughout this node. Assume the user only understands {{user_language}}. Only listen for and recognize speech in {{user_languag

e}}. Do not use English unless {{user_language}} is explicitly set to 'English'." 3. Add to your global node: "Speak only in the user's language ({{user_language}}) " --- ## Known Issues & Troubleshooting Function Node Silence Issue: Agents may stay silent after a function node when a function and response happen simultaneously due to message order issues before feeding to the LLM. [(4) ]() Agent Swap Issues: When swapping agents in Conversation Flow, ensure the first conversational node after the swap is properly configured—extraction may work but voice may not kick in on phone calls while working on web voice/chat. [(5) ]() Call Transfer with Caller ID: When using cold transfers with "Transferee's Number" selected, Twilio may not honor custom SIP headers in the REFER request. Consider using warm transfer for more control. [(6) ]() --- ## Configuration Tips - Use post-call analysis to extract structured data (Boolean, Text, Number, Selector types) for actionable insights [(7) ]() - Leverage batch calling directly from the dashboard with CSV upload and scheduling - Set appropriate call limits, routing, and other configurations to match your workflow ---

​ To learn more, see the sources I considered: [[1] Conversational Design](https://www.retellai.com/glossary/conversational-design) [[2] Agent Speaking for Both User and Assistant Roles](https://discord.com/channels/1186424376300679209/1433386000452681819) [[3] Language Switching](https://discord.com/channels/1186424376300679209/1397465772074467338) [[4] Conversation Flow agent potentially stay silent after function node](https://retell.discourse.group/t/conversation-flow-agent-potentially-stay-silent-after-function-node/135) [[5] Conversational workflows stopped working](https://discord.com/channels/1186424376300679209/1412495726646136942) [[6] Help on Twilio DID questions](https://retell.discourse.group/t/help-on-twilio-did-questions/24) [[7] Top 11 Vapi AI Alternatives for Conversational Voice Agents | Retell AI](https://www.retellai.com/blog/best-vapi-alternatives-for-enterprise-voice-ai) ​

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