Exotel's RESTful APIs make it easy to integrate Voice & SMS in your web or mobile application. Think,

The possibilities are endless! Exotel's APIs allow you to programmatically control a call by playing personalised greetings, diverting users to a unique call flow, pushing call information, getting call recordings, etc. The APIs are designed according to REST principles. Exotel's REST APIs are served over HTTPS and HTTP. However, we highly recommend communicating over HTTPS.

Images provided below are a schematic representation of how Exotel works when an outgoing or incoming call occurs.