Asterisk™ is a complete PBX in software. It runs on Linux and provides all of the features you would expect from a PBX and more. Asterisk™ does voice over IP in three protocols, and can interoperate with almost all standards-based telephony equipment using relatively inexpensive hardware.Asterisk™ is a complete PBX in software. It runs on Linux and provides all of the features you would expect from a PBX and more. Asterisk™ does voice over IP in three protocols, and can interoperate with almost all standards-based telephony equipment using relatively inexpensive hardware.
GNU Bayonne, the telephony server of GNU Telephony and the GNU project, offers free, scalable, media independent software environment for development and deployment of telephony solutions for use with current and next generation telephone networks
