PBX & Telephony Platform

Open source helpdesk software have been popping around in the last years. If you want a features-rich and mature helpdesk solution, look first at RT or OTRS. Many other open source helpdesk solutions exist for smaller or defect tracking oriented needs.

Leading open Source PBX & Telephony Platform software

Asterisk

Asterisk™ is a complete PBX in software. It runs on Linux and provides all of the features you would expect from a PBX and more. Asterisk™ does voice over IP in three protocols, and can interoperate with almost all standards-based telephony equipment using relatively inexpensive hardware.Asterisk™ is a complete PBX in software. It runs on Linux and provides all of the features you would expect from a PBX and more. Asterisk™ does voice over IP in three protocols, and can interoperate with almost all standards-based telephony equipment using relatively inexpensive hardware.

Other open source PBX & Telephony Platform software

Virtual PBX
Bayonne

GNU Bayonne, the telephony server of GNU Telephony and the GNU project, offers free, scalable, media independent software environment for development and deployment of telephony solutions for use with current and next generation telephone networks

Druid

Druid is an open source unified communications platform, built around technology such as Asterisk, IMAP, XMPP. Druid gives your organization access to the best available IP communications platform that bringing together voicemail, VOIP, mobile phone, faxes and instant messaging.