​ To learn more, see the sources I considered: [[1] Get Agent Versions](https://docs.retellai.com/api-references/get-agent-versions) [[2] Update Voice Agent](https://docs.retellai.com/api-references/update-agent) [[3] Create Voice Agent](https://docs.retellai.com/api-references/create-agent) [[4] Platform Changelogs | Retell AI](https://www.retellai.com/changelog) [[5] What is Backchanneling? And Why It Matters for Conversational AI | Retell AI](https://www.retellai.com/blog/how-backchanneling-improves-user-experience-in-ai-powered-voice-agents) [[6] AI Voice Agents in 2026: Everything Businesses Need to Know | Retell AI](https://www.retellai.com/blog/ai-voice-agents-in-2026) ​

### Answer Based on the available sources, I don't have specific information about a deprecation notice for the backchanneling setting. The sources show that backchanneling is an active feature in Retell AI [(1) ]() [(2) ]() [(3) ]() . Backchanneling controls whether the agent interjects with phrases like "yeah" or "uh-huh" to signify interest and engagement during conversations . The feature includes parameters like

enable_backchannel

,

backchannel_frequency

, and

backchannel_words

. The changelog indicates backchanneling was introduced as a feature in May 2024 [(4) ]() , and it's described in recent blog posts from 2025 as an important conversational feature [(5) ]() [(6) ]() . If you're seeing a deprecation warning in your dashboard or API responses, this may be related to recent platform updates not covered in the available documentation. For clarification on deprecation timelines or migration paths, I recommend checking the [Documentation]() or visiting [Hire certified Retell partner]() .

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