title: PushKit for VOIP iOS apps
body: <p>Maybe this is a trivial question, however it is not yet clear to me if the server side is impacted when <code>PushKit</code> frameworks will be applied in a <code>VoIP</code> iOS app.</p>
  
  <p>The <code>SIP</code> server for example sends an INVITE to my app, the notification is received in the app and the call is established. </p>
  
  <p>Is the server impacted when <code>PushKit.framework</code> is used? Who is sending the pushkit event? The <code>SIP</code> server or Apple? Is this similar to <code>APNS</code>?</p>