I've been working on an update to the Node-Red package for Jambonz, in this video I'll walk though getting started with Node-RED & Jambonz and then show you how to create a simple IVR to route calls to different departments.
Links:
https://www.jambonz.org/
https://nodered.org
https://flows.nodered.org/node/@jambonz/node-red-contrib-jambonz