How to implement App to App (VoIP) voice call using xamarin forms

We are developing a voice chat application using xamarin forms in visual studio 2017, I have been looking couple of days but could not find any app to app (VoIP) voice call xamarin forms github project after that i have found app to app (VoIP) voice call using sinch but it is available only xamarin native, Can anyone suggest how to do? or else provide me Xamarin Forms App to App(VoIP) voice call github project so that i can research right way

Note: I have found Xamarin Forms (VoIP) voice call github using twilio but it is binding ( even though i run the project while i am getting error, here i pasted below error

Error The “ResolveLibraryProjectImports” task failed unexpectedly. System.IO.FileNotFoundException: Could not load assembly ‘Twilio.Chat.Android, Version=, Culture=neutral, PublicKeyToken=’. Perhaps it doesn’t exist in the Mono for Android profile? File name: ‘Twilio.Chat.Android.dll’
Error CS0305 Using the generic type ‘CallbackListener’ requires 1 type arguments Twilio.Chat.Android Error CS0115 ‘CallbackListener.OnSuccess(Object)’: no suitable method found to override Twilio.Chat.Android Error CS0246 The type or namespace name ‘InternalPaginator’ could not be found (are you missing a using directive or an assembly reference?)

Hello @thiyaguperiyasamy,

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Greatly appreciated,

Hi @thiyaguperiyasamy,

Did you ever get anywhere with tutorials on this subject?

Hi @thiyaguperiyasamy 

found here , you get little bit information here regarding voip call 

Take a look at this solution : This solution fulfil to all your business needs

Highlights of This Solution

  • Voice Calling
  • App to App Calling
  • App to Phone Calling
  • Phone to App Calling
  • Call Queueing
  • Callback Service
  • Call Conference