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

# Stream Audio (WebSocket)

> Real-time audio streaming for upload_type: stream

Sessions created with `upload_type: stream` return a **`wss://` URL** as `upload_url`. Connect and stream — the server auto-detects the wire format from your first frame.

**Option A — raw binary:** send 16-bit LE, mono, 16 kHz PCM as binary frames.

```js theme={null}
const ws = new WebSocket(uploadUrl);
ws.binaryType = "arraybuffer";
ws.onopen = () => ws.send(pcmChunk);
```

**Option B — JSON envelope** (Twilio/Vobiz Media Streams compatible), base64 PCM payloads:

```json theme={null}
{ "event": "start", "start": { "mediaFormat": { "encoding": "audio/x-l16", "sampleRate": 16000 } } }
{ "event": "media", "media": { "payload": "<base64 PCM>" } }
{ "event": "stop" }
```

**To finish:** close the socket (flushes audio), then call [End Session](/ekascribe/api-reference/sessions/end-session) — closing alone does **not** start processing. Then poll [Get Session](/ekascribe/api-reference/sessions/get-session).