Asterisk is software that turns an ordinary computer into a voice communications server.
Asterisk is the world's most powerful and popular telephony development tool-kit. It is used by small businesses, large businesses, call centers, carriers and governments worldwide.
Asterisk is open source and is available free to all under the terms of the GPL.
AsteriskNOW
AsteriskNOW is the fastest way to get started building custom telephony solutions with Asterisk. Among the many applications you can create with AsteriskNOW are:
VoIP Gateway
Skype Gateway
IP PBX
Call Center ACD
Conference Bridge
IVR Server
Voicemail System
Call Recorder
Fax Server
Speech Server
Application: IP PBX
Application: VoIP Gateway
Build a VoIP-to-PSTN gateway using Asterisk, an analog or digital telephony interface card and a standard PC server
