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I'm aware of this thread: https://forums.developer.apple.com/thread/50106 But i'm still unclear what to do.We have to implement a VoIP application for our customer and are confused how to proceed. An End User needs to pick up a call initiated at a Video Door Station when somebody presses a door bel. In the infrastructure we have a local controller that forwards the SIP call to a cloud SIP server. This runs a script as part of its Dial Plan that sends the VoIP push notification and after that the SIP INVITE. iOS can wake up the app and now we have a connection.The App needs to keep the registration valid at the cloud SIP server valid by re-registering every 30 minutes. If invalidated, the SIP PBX will remove the registration details and phone will not receive any call or notification.Our question is: Should we use CallKit or Pushkit? And how do we keep this registration alive since VoIP background mode is deprecated.Hope anyone can point us in the right direction.Roberto