Xamarin PortSip Voip Client - xamarin

Has anyone tested the demo version from https://www.portsip.com/download, the Xamarin Client? If yes, works when xamarin client calls another client?
When I try to call on the Xamarin client, I receive the ECoreCallIdNotFound error and the call fails. Can anyone help me?
Thank's

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Twilio.Initialize is not working in xamrin android

Anyone have an idea for Twilio voice call, I have already added Twilio and Twilio Client
Twilio.Initialize is not available in xamrin android
Please you can try with the below code.
TwilioClient.Android.Twilio.Initialize (this.ApplicationContext, this);

Check if user has push notification turned on

I need some help. We have an app build with React Native that communicates with API that is build on Laravel. For push notifications we used One Signal. It works great, no problems there. The only issue we have is how can we know if user has push notifications enabled for our app? Is there any way that through One Signal we can check this one out?
Any help will be highly appreciated.
found this post similar to:
How can i check push notification permission for both ios and android in react native?
get the permission status then update to server using api from laravel.

How can I send a user to user message in Xamarin forms?

I know this is not a code related problem. I need an advice on what service can I use to send a direct message to a particular user using Xamarin forms. I have been studying about Firebase CM and SignalR but I am not sure which one will be better and easier to implement as I am new to xamarin. Any help would be appreciated.

Is there any alternative of Volley used in android to call REST services for Xamarin Forms?

I am looking for any alternative of volley in xamarin forms to communicate with REST services.
I am currently using HttpClient to communicate with REST services.
But now i am looking for some alternative which gives me advantages of volley.
I searched but nothing found .
If anybody knows please comment.
I know about Refit This is similar to Retrofit which is in the native android
You can use this in your Xamarin.Android Project and can create aa DependencyService in your Xamarin forms project to use and access Volley.
https://github.com/CSharpCross/Volley-For-Xamarin-Android
Or,
https://github.com/royd/Xamarin.Android.Volley

SignalR Not Working with Windows Auth

I've created a test MVC5 application to run the simple SignalR chat client shown here and everything worked as the tutorial described.
http://www.asp.net/signalr/overview/getting-started/tutorial-getting-started-with-signalr-and-mvc
I've then created another project where I enable Windows Authentication and my messages are not being received by the chat clients. However, my message requests are hitting the "ChatHub" Send method but my chat clients are not receiving the messages. Everything is identical to the original tutorial except for adding Windows Authentication. Any ideas what could be my problem? Thanks in advance.
jquery.signalR-2.1.2.min.js
Appears to be a user error. I jumped between the original SignalR tutorial and SignalR with MVC5 tutorial and ran into a discrepancy. Original SignalR tutorial had chat.client.addNewMessageToPage" and the SignalR with MVC5 tutorial "chat.client.broadcastMessage" and I must have botched the copy and paste job between projects and tutorials. Feeling a little sheepish at the moment.

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