Install the LInphone softphone app from Google Play Store. You can tap here to install it.
Once installed, launch the app.
In the next screen, tap on I UNDERSTAND to start the process.
Insert the info received in the configuration email here. Make sure to select TCP in the transport.
If configuration and network are OK; then you should see a small green dot at the top of the app, and the Connected status should appear. Now the app is ready to place and receive calls.