VAPI•2mo ago

Sending Structured Data during a call

Hi guys, I need a way for data that is captured to be sent to make as it is recieved and not at the end of a call. Is it possible to do that?

Thanks

Vapi Support BotAPP•11/20/25, 12:41 PM

Yes, you can stream real-time audio data from a live call using the "Call Listen" feature and a WebSocket connection. Here’s a Node.js example to receive and process audio as it arrives:

const WebSocket = require('ws');
let pcmBuffer = Buffer.alloc(0);
const ws = new WebSocket("wss://your-listenUrl/transport");

ws.on('message', (data, isBinary) => {
  if (isBinary) {
    pcmBuffer = Buffer.concat([pcmBuffer, data]);
    // Process or forward the audio data here in real-time
  }
});

const WebSocket = require('ws');
let pcmBuffer = Buffer.alloc(0);
const ws = new WebSocket("wss://your-listenUrl/transport");

ws.on('message', (data, isBinary) => {
  if (isBinary) {
    pcmBuffer = Buffer.concat([pcmBuffer, data]);
    // Process or forward the audio data here in real-time
  }
});

Replace "wss://your-listenUrl/transport""wss://your-listenUrl/transport" with your actual listenUrl.
For more details, see the Vapi call features documentation.

Source:

Vapi Call Features Documentation

⤵️ Mention @Vapi Support Bot for follow-ups 🐥

KyleAPP•11/21/25, 2:14 AM

Hi ronakp1234,

To help with generating structured data, ensure you've followed the setup and integration instructions:

Create your structured output: Use a JSON schema to specify the data you want to extract from calls. Here's a quickstart guide for setting this up.
Attach the structured output to an assistant: Ensure that the structured output is correctly linked to the assistant via the Dashboard under Artifact Plan or through API integration.
Test the setup: Use test calls to verify that data is extracted into the specified schema. See details on creating and testing calls in this guide.
Retrieve the structured data: Once a call ends, you can retrieve structured outputs via the API or view them in the Call Logs section of the Dashboard.

Ensure that your schemas are well-defined, including necessary validation patterns, and that any non-critical fields are optional to avoid partial extractions. For further details and troubleshooting tips, refer to the structured outputs documentation.

If you've already verified these aspects and the issue persists, consider reviewing logs for any validation errors or checking API configurations for any discrepancies.

Structured outputs quickstart | Vapi

Get started with structured data extraction in 5 minutes

Run Structured Output | Vapi

const WebSocket = require('ws'); let pcmBuffer = Buffer.alloc(0); const ws = new WebSocket("wss://your-listenUrl/transport"); ws.on('message', (data, isBinary) => { if (isBinary) { pcmBuffer = Buffer.concat([pcmBuffer, data]); // Process or forward the audio data here in real-time } });

Sending Structured Data during a call

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