Asterisk is a hybrid TDM and packet voice PBX (Private Branch eXchange) and IVR platform with ACD functionality. It acts as middleware between the Internet (IAX, SIP, MGCP, Skinny, H.323), telephony channels (like Zaptel, T1, PRI, E1, FXO, FXS, VoIP, VoFR, ISDN, modems, Internet Phone Jack, etc.), and applications (like voice-mail, conferencing, directories, MP3 players, intercoms, etc.). It has many advanced features such as a codec translation API. The base distribution includes several channel backends, as well as applications. However, the beauty of Asterisk is its ability to be extended using its APIs, dynamic module loader, and AGI scripting interface. End users can even write their own applications that run on the system in C or any scripting language of their choice.
This package contains generic Linux drivers for the Conexant HCF (controllerless) modem family used by many modem and computer system manufacturers. They should work on most current Linux distributions, based on the 2.4.x kernels. Some systems may require kernel recompilation with special ACPI patches.
This package contains generic Linux drivers for the Conexant (formerly Rockwell) Softmodem HSF modem family, which are used by many modem and computer system manufacturers. They should work on most current Linux distributions, based on the 2.4.x kernels. A Pentium processor with the MMX enhancements is required. Some systems may require kernel recompilation with special ACPI patches. Preemptible kernels are not yet supported.
Elastix is a software appliance that 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. The goals of Elastix are reliability, modularity, and ease-of-use. It also features strong reporting capabilities.
The GNU Gatekeeper is a free H.323 gatekeeper based on the OpenH323 project. You can use it to manage a Voice-over-IP network and let endpoints (e.g., Netmeeting) communicate through symbolic names. It also has an external interface for billing and other applications. It runs on a number of Unix versions (including Linux and Solaris) and Windows.