RTCall.js — A library for Browser-to-Browser audio-only calling

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How to make audio-only calls using RTCall?

// https://www.webrtc-experiment.com/RTCall.js

var call = new RTCall();

// "onincomingcall" fires each time if someone calls you
call.onincomingcall = function(caller) {
   call.receive(caller.receiverid);
};

// "oncustomer" is fired only for admin
// you can set admin like this:
// call.admin = true;
call.oncustomer = function(customer) {
   call.call(customer.callerid);
};

// "onstream" returns you remote media stream
call.onstream = function(e) {
   // e.stream   ---- remote media stream object
   // e.callerid ---- id of the remote person
   
   audio = e.audio;
   audio.play(); // "e.audio" object is paused by default
   document.documentElement.appendChild(audio);
};

// initializing "RTCall" object
call.init();

// customers can call "admin" using his caller-id
call.call('admin-caller-id');

How to use custom signaling channel?

By default, RTCall is using WebSockets for signaling. You can use socket.io, WebSync or services like firebase, pubnub, pusher etc.

call.openSignalingChannel = function(config) {   
   var SIGNALING_SERVER = 'https://socketio-over-nodejs2.herokuapp.com:443/';
   var channel = config.channel || this.channel;
   var sender = Math.round(Math.random() * 60535) + 5000;

   io.connect(SIGNALING_SERVER).emit('new-channel', {
      channel: channel,
      sender : sender
   });

   var socket = io.connect(SIGNALING_SERVER + channel);
   socket.channel = channel;

   socket.on('connect', function () {
      if (config.callback) config.callback(socket);
   });

   socket.send = function (message) {
        socket.emit('message', {
            sender: sender,
            data  : message
        });
    };

   socket.on('message', config.onmessage);
};

Or Firebase:

call.openSignalingChannel = function (config) {
    var channel = config.channel || this.channel;

    var socket = new Firebase('https://webrtc.firebaseIO.com/' + channel);
    socket.on('child_added', function (snap) {
        var data = snap.val();

        config.onmessage(data);

        // we want socket.io behavior; 
        // that's why data is removed from firebase servers 
        // as soon as it is received
        // data.userid != userid && 
        if (data.userid != userid) snap.ref().remove();
    });

    // must override "send"
    socket.send = function (data) {
        socket.push(data);
    };

    config.callback(socket);
};