You can build voice, fax and messaging REST applications that run in your own web server using our REST API. This has several language wrappers that are easy to use and support many advanced features.
Your Outbound and Inbound Services point to the URL of the First Page of your application.
Your First Page responds with a list of telephony actions to perform, after which the next page or your application is requested.
Quickstart guides help you to start using the REST API and plenty of sample applications illustrate how to use each action.