We use VOIP services of apple to receive calls in the background and in killed state.
In your Appdelegetae, register for voip notification by conforming to the following delegates
|Voice over IP|
Update your VOIP token using the below methods when an VOIP token gets updated.
|TOKEN||Apns or Voip Token|
didReceiveIncomingPushWith method, you will receive the call payload. In order to continue processing the call, you must send the payload to the SDK method below.