In this tutorial, you will learn how to create an iOS application using Objective-C and the Nexmo iOS Client SDK, and then write the code to make an app to app call.

Two parts are needed to achieve this:

  • An iOS application that will make the voice call using the Client SDK.
  • A publicly accessible URL that serves instructions on how to handle the call. To accomplish this, you will create a webhook server using Node.js, Express and localtunnel.

Completed project

If you would like to follow along without building the app yourself, the completed project is available on Github - please see the app-to-app-swift folder.

This tutorial uses NexmoClient version 4.0