Asterisk-based telephony solutions offer a rich and flexible feature set. Asterisk offers both classical PBX functionality and advanced features, and interoperates with traditional standards-based telephony systems and Voice over IP systems. Asterisk offers the advanced features that are often associated with large, high end (and high cost) proprietary PBXs. With Asterisk becoming one of the major players in the PBX world and leading the VOIP industry there are needs for front end GUIs both for end users as well as administrators. This guide will walk you through creating those GUIs and give you the knowledge you need to continue developing a system that fits your needs.