Objective-C
Building the interface
To be able view the connection status of the app you will need to add a UILabel element to the screen. Open ViewController.m and add it programmatically by replacing the entire file content with the following:
Build and Run
Run the project again (Cmd + R) to launch it in the simulator.

Receiving a phone call in-app
You receive a call from a phone to your app
Steps
1
Introduction to this task2
Prerequisites3
Create a webhook server4
Create a Vonage Application5
Buy a Vonage number6
Link a Vonage number7
Create a User8
Generate a JWT9
Xcode Project and Workspace10
Project permissions11
Building the interface12
NXMClient13
Receive a call14
What's next?