SylkServer WebRTC gateway application¶

Starting with version 3.0.0 SylkServer includes a WebRTC gateway application. The application implements a WebSocket protocol which WebRTC endpoints can use in order to interact with the SIP world.

Architecture¶

TODO

WebSocket API¶

SylkServer offers the WebSocket API in order to interact with the WebRTC gateway in the ws(s)://hostname:port/webrtcgateway/ws endpoint. Both WebSocket and Secure WebSocket are supported, depending on how SylkServer was configured, check the configuration section.

The API uses JSON messages and is modeled around 2 concepts: requests and events.

A request represents an action which SylkServer should perform, and it's identified with a transaction ID which the user must provide. SylkServer will reply with either an 'ack' or an 'error' response, with the associated transaction ID. An example transaction is that of adding an account.

Events are notifications sent by SylkServer to the client. They are the result of some change triggered by a user action, but they don't have a transaction ID associated with them. An example event would be the connection state changed event.

All messages are valid JSON and contain the "sylkrtc" key indicating the message type. A message without the "sylkrtc" key is an invalid message.

Establishing the connection¶

In order to connect to SylkServer to begin to use the API a WebSocket connection must be established, using the sylkRTC-1 subprotocol. Example:

var conn = new WebSocket('wss://example.com/webrtcgateway/ws', 'sylkRTC-1');

After the connection is established, a 'ready' event will be sent to the client, indicating that the connection is ready to be used:

{
  "sylkrtc": "event",
  "event": "ready" 
}

Example:

var conn = new WebSocket('wss://example.com/webrtcgateway/ws', 'sylkRTC-1');
conn.onmessage = function(event) {
    var message = JSON.parse(event.data);
    switch (message.sylkrtc) {
        case 'event':
            if (message.event === 'ready') {
                console.log('Ready to rock!');
            }
            break;
        default:
            console.log('Received message type: ' + message.sylkrtc);
            break;
    }
};

Account management¶

TODO

Calling¶

TODO

Configuration¶

TODO

Client libraries¶

In order to interact with SylkServer's WebRTC gateway, we provide the sylkrtc.js JavaScript library. It implements the API described in this document in an easy to use manner. Check the README file in the project for the JavaScript API documentation.