> ## Documentation Index
> Fetch the complete documentation index at: https://documentation.uponai.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Debug Call Transfer Failure

> Troubleshoot call transfers that aren't triggering or are failing after being triggered.

## Agent-Specific Troubleshooting

<Tabs>
  <Tab title="Single/Multi-Prompt Agents">
    <Steps>
      <Step title="Verify transfer_call function">
        Confirm you've added the `transfer_call` function to your agent's function list. See the [Function Calling Guide](/build/function-calling-overview).
      </Step>

      <Step title="Review transfer conditions">
        Update your prompt to clearly define when a transfer should occur. Ensure the `transfer_call` function description is specific and unambiguous. Test with sample scenarios to validate triggers.

        See [Call Transfer Setup](/build/transfer-call).
      </Step>
    </Steps>
  </Tab>

  <Tab title="Conversation Flow Agents">
    <Steps>
      <Step title="Check transfer node configuration">
        Verify your flow has a transfer node, it's connected to other nodes, and transition conditions are correctly set up.
      </Step>

      <Step title="Review transfer node settings">
        Confirm the transfer destination is configured correctly and the transfer conditions are clear and reachable.

        See [Conversation Flow Transfer Setup](/build/conversation-flow/call-transfer-node).
      </Step>
    </Steps>
  </Tab>
</Tabs>

## General Notes

<Note>
  Call transfer is only supported for **phone calls** — not web calls.
</Note>

## If Transfer Triggers but Fails

**Telephony issues** — Transfer failures are similar to outbound call failures. Check the SIP connection log in the call logs and refer to [Debug Outbound Call](/Reliability/debug/debug-outbound-call).

**Could not detect human** — If human detection is enabled, the transfer may fail if:

* No human was present (e.g. IVR or voicemail answered)
* The other party spoke after the detection timeout expired
* Speech was too similar to an IVR and wasn't recognized as human