I sign up for Tropo and set up some sample code to play with the telephony related stuff. It is free to test when in developing mode until your apps run into production mode then need to pay.
Another library cron.js, it is able to schedule recurring jobs in Node.JS. It used Unix’s Cron liked expression to trigger the job.
Both of them just provide easier to use API that easily integrated into any enterprise application.
Node.JS is a relatively new programming language but its community grows extremely fast. There are many exciting libraries built into Node.JS. It may still not yet suitable for enterprise application but some of the organizations had tried to use it in production, for example, Linked In used Node.JS to build its entire mobile site platform.