Asterisk is an open source private automatic branch exchange (PABX) for UNIX systems. Among other uses, it provides for voice messaging, hold queues, call agents, hold music, enquiry calls, call distribution and conference calls.
Read full page topKamailio is an open source SIP server. This fork of the OpenSER project (in 2005) is one of the most complete PBXs.
Read full page topKannel was developed in 1998 by WAPit Ltd, a company that no longer exists today. The project is now managed by members of the Kannel Group, which includes major corporations.
Read full page topXiVO is a complete solution for IP telephony and unified communications for enterprises, created by Sylvain Boily, Proformatique founder and now partner of Avencall. The XiVO solutions provides native value added functionalities for business. Since 2012, XiVO has been recognised as the leading solution based on Asterisk in Europe.
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