Wanted to ask how to get Voice AI agent to transfer to human agent phone number. The Voice AI agent says that they transferring but the human phone number does not ring..

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To resolve the issue where your Voice AI agent says it's transferring but the human phone does not ring, ensure your transfer tool includes the required

destination

parameter and that your SIP trunk supports SIP REFER. Here’s an example configuration for your transfer tool’s parameters:

json
"parameters": {
  "type": "object",
  "properties": {
    "destination": {
      "type": "string",
      "enum": ["+1234567890"], // Replace with your external number in E.164 format
      "description": "The destination to transfer the call to."
    }
  },
  "required": ["destination"]
}

Update your tool with this parameter and verify SIP REFER is enabled with your provider for successful call transfers ([Vapi documentation: call forwarding](https://docs.vapi.ai/call-forwarding)). Sources: - [Vapi documentation: call forwarding](https://docs.vapi.ai/call-forwarding) - [Vapi SIP Trunking Telnyx external number call forwarding troubleshooting](https://discord.com/channels/1211482211119796234/1343963959421829172)

Message marked as helpful by @GIDEON! 🎉

I have same issue

I can help you with solving this..

Please provide a call id where the call failed to transfer