Node.js Websocket Echo Repeat Server

This sample shows how to connect a Voice API call to a websocket endpoint. The websocket acts as an "echo server", repeating everything that the caller says.

Setup

Install the Nexmo CLI

Run the following at a terminal prompt to install the CLI and configure it with your api_key and api_secret, which you will find in the Developer Dashboard:

npm install -g nexmo-cli
nexmo setup <API_KEY> <API_SECRET>

Purchase a Nexmo number

If you don't already have one, buy a Nexmo virtual number to receive inbound calls.

List available numbers (replace GB with your two-character country code):

nexmo number:search GB

Purchase one of the numbers:

nexmo number:buy 447700900001

Create a Voice API application

Use the conversation-api-function tool to create an application and link the LVN above

conversation-api-function config-new -a <API_KEY> -s <API_SECRET> -l <LVN>

Install dependencies

Run the following to install the required modules:

nvm use
npm i

Run it

1. Execute the following in your project directory:

npm start

2. Call your Nexmo virtual number and listen to the welcome message.

3. Speak into the phone and hear your voice echoed back to you by the websocket.