How to Connect a Phone Call to Nexmo In-App Voice

Nexmo's Voice API allows developers to build high-quality programmable voice applications in the cloud, enabling features such as managing outbound and inbound calls, recording and storing calls, creating conference calls, and sending text-to-speech messages. Nexmo Stitch enables communications across multiple channels, including in-app messaging and in-app voice. To forward an incoming phone call from a Nexmo phone number to a Stitch user, developers must implement a Webhook and link it to a Nexmo Voice application, requiring the use of Node.js, ExpressJS, and Vonage API Account credentials. The process involves creating a webhook endpoint that logs events from Nexmo Application, responding to HTTP GET requests with NCCO, connecting calls with an existing Stitch user, and associating the application with the virtual number rented from Nexmo.