Twilio浏览器调用传入连接状态

Question

在浏览器到浏览器中，当Bob没有接听到Alice的电话时，Alice没有收到任何应答并断开与Bob的联系，但Bob从未知道Alice已断开连接。

Bob如何知道Alice已断开连接？

爱丽丝：

var connection;

Twilio.Device.setup(token);
Twilio.Device.connect(onConnect);
Twilio.Device.disconnect(onDisconnect);

function onConnect(conn) {
  connection = conn;
  console.log("onConnect: " + connection.status()); //onConnect: open
};

function onDisconnect() {
  connection.disconnect();
  console.log("onDisconnect: " + connection.status()); //onDisconnect: closed
}

$('.close').one("click", function() {
  Twilio.Device.disconnectAll();
});

$(document).ready(function () {
  Twilio.Device.connect({
    agent: 'bob'
  });
});

鲍勃：

  var connection;

  Twilio.Device.setup(token);
  Twilio.Device.incoming(onIncoming);
  Twilio.Device.disconnect(onDisconnect);

  function onIncoming(conn) {
    connection = conn;
    console.log("onIncoming: " + connection.status()); //onIncoming: pending
  }

  //never arrives here when caller disconnect
  function onDisconnect() {
    console.log("onDisconnect: " + connection.status());
  }