efficient-indigoE
VAPI•7mo ago
efficient-indigo

Call hangs up after transferCall

greetings folks

I am not 100% if Vapi's transferCall feature works. I have a custom tool to transfer calls. Here's a beginning of how this tool registration
  "id": "a8fba37c-529a-4dac-8d57-5f98ea09eb3c",
  "createdAt": "2025-01-30T00:45:30.043Z",
  "updatedAt": "2025-04-25T20:39:30.605Z",
  "type": "transferCall",
  "function": {
    "name": "redirectCall",
    "description": "Use this function to transfer the call to various contacts across different departments",
    "parameters": {
      "type": "object",
      "properties": {
        "destination": {
          "description": "The destination phone number for the call transfer",
          "type": "string",
          "enum": [
            "+14082066610",
            "+14089131082",
            ...
            "+19543426123",
            "+14709451018"
          ]
        }
      },
      "required": [
        "destination"
      ]
    }
  },
  "messages": [
    
  ],

The VAPI assistant shows that this function does get called. Here's an excerpt from "Call Log Messages":
{
  "role": "tool_calls",
  "time": 1748978304436,
  "message": "",
  "toolCalls": [
    {
      "id": "call_EK83vIO49iUXO2ndlOLl7eUl",
      "type": "function",
      "function": {
        "name": "redirectCall",
        "arguments": "{\"destination\": \"+14089131082\"}"
      }
    }
  ],
  "secondsFromStart": 39.142
}

but the actual call transfer does not happen.
The calls simply hang up without additional messaging.

Any idea what might be going on here?

Thanks
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