The extension points shown include two in the WebRTC Session Controller Groovy script processing: 1) Using Groovy scripts to manage JSON data and 2) Using Groovy scripts to manage SIP. The extension points also include 3) Using Media Engine to affect media content and capabilities, and 4) Using policy data with your PCRF to affect calls. See the WebRTC Web Application Developer's Guide for the final extension points: 5) Extending a JavaScript API package, and 6) Adding a new JavaScript API package.