----------------------------- **While I generate an answer, here are some sources that might be helpful**: * [Create Phone Call]() * [Call Functions]() * [Delete Phone Number]() * [Custom LLMs]() -----------------------------

### Answer In Vapi, to make a POST API call to an external server and pass raw JSON in the body within functions, you would typically define custom functions for your assistant. These custom functions can be configured to call external endpoints. When defining a custom function in the assistant configuration, you can specify the

serverUrl

to your external API endpoint. Additionally, you would manage the request details, including the method and body content, on your server or the endpoint that handles the function call from Vapi [(1)]() . Here's a conceptual example of defining a custom function in your assistant configuration:

json
{
  "functions": [
    {
      "name": "fetchPrediction",
      "description": "Fetches prediction from external server",
      "parameters": {
        "type": "object",
        "properties": {
          "question": {
            "type": "string",
            "description": "The question for prediction"
          }
        }
      },
      "serverUrl": "https://your-server-url.com/handle-function"
    }
  ]
}

This example does not directly execute the POST request within Vapi but triggers a custom function that should be handled by your server. Your server would then construct and execute the POST request to the external API with the raw JSON body. Remember that the actual request to the external API, including setting the request method to POST and specifying the JSON body, would be implemented on your server, which receives the function call from Vapi. For specifics on making HTTP requests from your server, you would use your server-side technology's appropriate HTTP client capabilities, similar to how you might be using Postman or cURL for testing.

Got it. Tagging @User for additional help.