Elastix is an open source based Unified Communications Server that brings together IP PBX (Asterisk), Email, IM, Faxing and Collaboration functionality. It is known for having an easy-to-use Web interface and including capabilities such as a Call Center software with predictive dialing. The Elastix functionality is based on open source projects such as Asterisk, HylaFAX, Openfire and Postfix. Those packages offer the PBX, Fax, Instant Messaging and Email functions, respectively.

Elastix integrates the best tools available for Asterisk-based PBXs into a single, easy-to-use interface. It also adds its own set of utilities and allows for the creation of third party modules to make it the best software package available for open source telephony.

The goals of Elastix are reliability, modularity and ease-of-use. These characteristics added to its strong reporting capabilities make it the best choice for implementing an Asterisk-based PBX.