---
title: Stream Applet
slug: exotel-agentstream/stream-applet
docTags: 
createdAt: 2025-09-27T08:28:25.611Z
---

**Unidirectional Streaming**

Unidirectional Streams allow you to Stream live calls over WebSocket in a single direction, from Exotel to the WebSocket Endpoint. Some of the use cases for this are live transcription, realtime monitoring of agents, realtime coaching etc.

**Configuring a Unidirectional Stream-Stream applet **

You can enable unidirectional streaming on a call flow using the Streaming Applet. 



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**The applet takes 3 parameters :**



**1. Action** - You can either start a new stream or stop a stream that you started earlier in the same call flow. You will use the Stop action if you have started a unidirectional Stream earlier in the same flow. When you choose stop, that is the only input you need to configure 

**2. URL** - This is the URL to which Exotel will stream the voice media. You can either specify a WSS endpoint or an HTTPS endpoint. If you specify an HTTP/HTTPS endpoint, Exotel expects the HTTPS endpoint to return a WSS URL in its response. This is to allow 

a. Dynamic endpoints for the same call flow
b. Have dynamic custom parameters that can be passed to the websocket endpoint to handle any application specific customization


When you specify a https endpoint, it must return a json with the key “url”  

```json
{ 
"url" : "wss://streamhandler.yourdomain.com" 
}  
```

On receiving this, Exotel will initiate a connection to wss\://streamhandler.yourdomain.com 

**3. Next Applet**
 In the case if Unidirectional Stream, the Stream would be created and the call flow proceeds to the next applet configured