We show here how to build a simple Voicebot using:

• Voicegain Telephony Bot API
• AWS Lambda
• RASA

We need to use AWS Lambda as a translation layer between the Voicegain Telephony Bot API and the RASA API.

Overview

Here is a sequence diagram illustrating how the whole setup will work. As you can see it is very simple (AIVR is our internal name for Telephony Bot API Runtime):

Prerequisites

In order to build a working bot you will need:

• Voicegain account with Telephony Bot API feature enabled.
• Phone number from Voicegain - see how to purchase via the Web Console.
  • You can also reach Voicegain Telephony Bot API via a SIP address
• AWS Lambda function - if you are new to AWS Lambda here is how to start.
• RTC-App using the purchased phone number and pointing to the AWS Lambda http url
• Working RASA application - this you will need to provide on your own. On RASA server RestInput needs to be enabled, see here.

AWS Lambda function explained

Sample code with comments for AWS Lambda (in node.js and python versions) can be found at Voicegain github.