I am implementing a webrtc app using twilio platform (for both ios and android). To be consistent with iOS 10, I need to integrate the CallKit which is activted in response to an external notificationn, such as a VoIP push notification. I was wondering which platform is better (e.g Amazon SNS, PubNub, Parse etc) would be better for implementing the push notification in back-end (I use node.js).
Note: I have seen some discussion/question regarding pubub vs SNS (e.g What is advantage and disadvantage of using pubnub over Amazon Simple Notification Service (sns)?). But those discussion are pretty old (3 years ago). In addition, they do not address/cover Callkit!