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www.asterisk.org

Asterisk :: The Open Source PBX & Telephony Platform |

An open source communications platform, Asterisk® is a complete IP PBX in software. It runs on a wide variety of operating systems including Linux, Mac OS X, OpenBSD, FreeBSD and Sun Solaris and provides all of the features you would expect... More

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Ranked:

#1 in Asterisk, #1 in IP Telephony, #1 in Phone Systems, #1 in SIP, #1 in Telephony, #1 in Voice Over IP, #1 in VoIP, #1 in VoIP Telephony, #2 in IP Phone, #14 in Telecom