Does GCM works with iOS PushKit framework?
<p>Is it possible to register for and receive Voip pushes (PushKit pushes) on iOS using Google Cloud Messaging (GCM) service ?</p>

<p><a href="https://developers.google.com/cloud-messaging/ios/start" rel="nofollow">https://developers.google.com/cloud-messaging/ios/start</a></p>