How to implement App calls when iPhone is locked like imo, whatsapp and skype?

Question

I have been trying to integrated VOIP on my application. But not finding a way to implement background app calling functionality. Anybody please let me know how to achieve background calls using VOIP.

Answer 1

You can use VoIP Push and CallKit to handle calls in background or in Inactive state or locked.

Learn more here...

1. https://medium.com/@yusukek/system-calling-screen-with-callkit-77004b1224e5#.ezwhgdw3h

2. https://developer.apple.com/reference/callkit

3. https://developer.apple.com/reference/pushkit