Youcantcall.us provides a web-service for rejecting and managing un-wanted callers. Developers of web-based telephony services like Twilio, Cloudvox and Tropo can easily add these tools to their existing platform. The API uses RESTful calls and responses are formatted in XML.
If you are writing a telephony system using the Twilio API, Tropo API, or Cloudvox API, you can interface with YouCantCall.us to shield your system from phone spam. Now wouldn’t it be great if the YouCantCall.us API could be integrated into a “block” button that appeared on standard phones?