This flow streams an audio file into an outbound phone call.
There is a step-by-step tutorial on this, if you'd like to follow along.
Before getting started, you’ll need a couple of things:
- A Nexmo account - create one for free if you haven't already
- A way to expose your server to the internet. This either means you're running a hosted version of Node-RED, or in case you're developing locally, using a tunneling service like ngrok - get up to speed with this Getting Started with Ngrok in Node-RED tutorial