Bug 977588 - [Dialer] The Active call screen does not have the option to place calls on hold.

No, no, just to move the:
```javascript
var isEstablishing = telephony.calls.some(function (call) {
  return call.state == 'dialing' || call.state == 'alerting';
});
```
to a function so it can be reused from both functions, and from any other place :)