FreeSWITCH

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FreeSWITCH is a free/open source software telephony application written in the C Programming Language. FreeSWITCH is built from the ground up and designed to take advantage of as many existing software libraries as possible.

FreeSWITCH makes it possible to build a free/open source PBX system or a free/open source VOIP switching platform as well as unite various technologies such as SIP, H.323, IAX2, LDAP, Zeroconf, XMPP / Jingle etc. FreeSWITCH can also be used to interface with other free/open source PBX systems such as GNU Bayonne, YATE or Asterisk (PBX).

"One of the fundamental goals of the FreeSWITCH project is to leverage as much expertise from the open source community and, if at all possible, to prevent duplication of work. That said, it is sad but true that not all existing software libraries fit the bill but we try as hard as possible to make it happen."[1]