This chapter introduces the components that comprise the GUI and help it work with Asterisk. It describes the installation of the web server and the GUI components for those who are not using the AsteriskNOW distribution. It also shows you how to modify the GUI to suit your purposes. Technical information is also provided so that developers wishing to create their own GUI or application can utilize the web server and GUI components. We’d like to thank the folks at Digium for writing this chapter, especially the code examples, which they developed and tested.