# NOT\_SUPPORTED\_ERROR: WebRTC not supported, js engine: hermes

**URL:** https://react-native-webrtc.discourse.group/t/not-supported-error-webrtc-not-supported-js-engine-hermes/1962
**Category:** General040642add70aa006ef56b5af5b5acae3
**Created:** [April 2, 2024, 5:58am UTC](https://react-native-webrtc.discourse.group/t/not-supported-error-webrtc-not-supported-js-engine-hermes/1962 "2024-04-02T05:58:11Z")
**Posts on this page:** 2
**Page:** 1

<div class="post-metadata">

### Author: ![Ali338991](https://yyz2.discourse-cdn.com/free1/user_avatar/react-native-webrtc.discourse.group/ali338991/32/805_2.png) [@Ali338991](https://react-native-webrtc.discourse.group/u/Ali338991)
#### Post date: [April 2, 2024, 5:58am UTC](https://react-native-webrtc.discourse.group/t/not-supported-error-webrtc-not-supported-js-engine-hermes/1962/1 "2024-04-02T05:58:11Z")

</div>

i am creating a new project with 0.73.6 React native version and react-native-webrtc@118.0.3  
and “jssip”: “^3.10.1”,

and trtig to tets this code

// Create our JsSIP instance and run it:

var socket = new JsSIP.WebSocketInterface(‘wss://sip.myhost.com’);  
var configuration = {  
sockets: [socket],  
uri: ‘sip:1015-demo@sip.voxo.co’,  
password: ‘F249YCBmDarxsfuC’,  
};

var ua = new JsSIP.UA(configuration);

const handleJssip = () =\> {  
ua.start();

```
// Register callbacks to desired call events
var eventHandlers = {
  progress: function (e) {
    console.log('call is in progress');
  },
  failed: function (e) {
    console.log('call failed with cause: ' + e.data.cause);
  },
  ended: function (e) {
    console.log('call ended with cause: ' + e.data.cause);
  },
  confirmed: function (e) {
    console.log('call confirmed');
  },
};

var options = {
  eventHandlers: eventHandlers,
  mediaConstraints: {audio: true, video: true},
};

var session = ua.call('sip:9996@example.com', options);

```

};

it give me error  
NOT\_SUPPORTED\_ERROR: WebRTC not supported, js engine: hermes

---

<div class="post-metadata">

### Author: ![saghul](https://yyz2.discourse-cdn.com/free1/user_avatar/react-native-webrtc.discourse.group/saghul/32/4_2.png) [@saghul](https://react-native-webrtc.discourse.group/u/saghul)
#### Post date: [May 13, 2024, 12:14pm UTC](https://react-native-webrtc.discourse.group/t/not-supported-error-webrtc-not-supported-js-engine-hermes/1962/2 "2024-05-13T12:14:39Z")

</div>

Have you used `registerGlobals` ?