OStatic

sipX ECS (Enterprise Communications Server) is an open source voice over IP telephony server. Its main feature is a software implementation of the Session Initiation Protocol (SIP), which makes it an IP based communications system (IP PBX). Featurewise, it is not unlike Asterisk, a very popular open source PBX, but the design of sipX deviates from Asterisk in many ways. Development started in 1999, but in 2004 Pingtel Corp contributed the codebase to the non-profit organization SIPfoundry. It is an open source project since then. sipX is available under the GNU Lesser General Public License (LGPL) as well as a commercial offering from Pingtel Corp under the name Sipxchange. Its software platform is Linux.sipX includes many features of a traditional private branch exchange (PBX) like voice mail, interactive voice response systems, auto attendants and the like.The main components of the system is a SIP switch or router around which sipX is architected. In contrast to its main open source competitor Asterisk PBX and most commercial offerings that use SIP as a transport protocol, SipX doesn't play the role of a back-to-back user agent. This approach led to a modular and highly scalable system. All major components of sipX are implemented as servers and do not necessarily have to reside on a single machine only. Distributed installations are known.   [edit]