Sinch : Know the number of participants in a conference call

I am building a conference calling app using Sinch in Android. I can now establish conference calls and add participants to it successfully.

Now I would like to add some capabilities to my app:

1. Know the number of participants at a given time.
2. Mute a particular user.

I was looking into this link.. I understand that Sinch is giving some REST services to achieve the above services. I have never worked with REST web services in Android. I also went through the tutorials section and was unable to find a tutorial on how to call a REST API end point from Android.

I would like a simple walkthrough or a guide to call Sinch REST services from Android, especially to achieve the first capability (know the number of participants).

Both of this can be done by calling the Sinch REST API from your app.

Refer here : Link 1

If you don't know how to use REST API. I recommend using either Volley or Retrofit to make the network calls. Various tutorials on how to use them both are available on the net. Please refer that.