Calling with RasPi, Puck.JS and Nexmo Websockets
This project demonstrates how to initiate an outbound call via Nexmo triggered from a url, the call will then be connected to the machine that is running the code via a websocket for a 2 way audio call.
The code runs on either a Raspberry Pi 3 with an attached USB speaker and Mic or on a Macbook, Note: I have had varible results using the Pi Zero W, I think it struggles to be stable.
Clone this repo to your local machine, if you are running on a Pi then execute setup.sh as root to install the required packages.
Then just run
npm install
You will need a nexmo application created for this to use, don't worry about the incomming answer_url and event_url parameters as it only uses outbound calls.
You need to save the private key in the project folder as private.key and add the application ID to the config.json file
You will also need to set the callerid to a nexmo number on your account and the dest to be the phone number you want to be called both of these are also in config.json
Just type node index.js to run the application (on a Pi this needs to run as root)
After a few momemnts you will see a few things logged to the console (the order may vary)
App listening on port 8000!
Ngrok connected as: https://7903af6d.eu.ngrok.io
This confirms that the web server is running on port 8000 You have connected to ngrok for a tunnel to expose the server to the internet
Now load the ngrok url with /call on the end and it will connect a call to the number you have configured as dest in config.json