### Answer Based on the available documentation, Retell AI does not have a built-in capability to detect AI-generated callers on inbound calls. The documentation covers inbound call handling through the inbound webhook [(1) ]() , which allows you to dynamically configure calls by setting agent overrides, dynamic variables, and metadata when an inbound call arrives . The webhook receives information like

from_number

,

to_number

,

agent_id

, and

agent_version

, but there is no mention of AI caller detection signals or related metadata fields. For your use case, you would need to implement a custom detection solution outside of Retell's native features. Here's a potential approach within Retell's inbound architecture: Custom Implementation Approach: 1. **Inbound Webhook Integration**: Set up an inbound webhook URL at the phone number level [(1) ]() [(2) ]() . When a call arrives, your webhook endpoint receives the call details. 2. **External AI Detection Service**: Integrate a third-party AI voice detection service in your webhook handler to analyze the incoming call audio or behavioral patterns. 3. **Dynamic Variables for Routing**: Based on the detection result, return dynamic variables in your webhook response that indicate whether AI was detected [(1) ]() [(3) ]() . For example:

json
{
  "call_inbound": {
    "dynamic_variables": {
      "caller_type": "ai_detected"
    }
  }
}

[(1) ]() 4. **Conversation Flow Conditional Logic**: Use the dynamic variable in your Conversation Flow to create a conditional branch that routes to a transfer node when

{{caller_type}}

equals "ai_detected" [(3) ]() . This approach leverages Retell's inbound webhook architecture [(1) ]() and dynamic variables system [(3) ]() to integrate external AI detection capabilities.

​ To learn more, see the sources I considered: [[1] Inbound call & SMS webhook](https://docs.retellai.com/features/inbound-call-webhook) [[2] Create Phone Number](https://docs.retellai.com/api-references/create-phone-number) [[3] Dynamic variables: personalize Retell agent calls](https://docs.retellai.com/build/dynamic-variables) ​

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

### Answer I don't have information indicating that Voicemail Detection can identify whether an inbound caller is an AI system rather than a live human. The available source only discusses Voicemail Detection in the context of identifying voicemail greetings (e.g., carrier default messages) so the AI agent can hang up appropriately [(1) ]() — it does not describe any capability for distinguishing AI-generated callers from humans. I could try to answer this generally based on my broader knowledge if that would help — let me know.

​ To learn more, see the sources I considered: [[1] Voicemail detection - only working on carrier default](https://discord.com/channels/1186424376300679209/1354391344864297040) ​

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