VoIP vendor Pingtel is spearheading the endeavor by contributing to the open-source movement source code for its Session Initiation Protocol (SIP) software, including software for its SIPxchange ...

Pingtel has contributed code for its software-based SIPxchange IP-PBX and Instant Xpressa softphone to the open-source movement, which run on Linux-based hardware and are available to download ...

Pingtel will license its IP PBX call control platform, which runs on Linux, as well as its APIs, softphone applications, and IP handset firmware code under the Library General Public License, or LGPL.

A softphone, although similar, requires a VoIP subscription. Softphones need some form of internet connectivity–it doesn’t have to be Wi-Fi. VoIP can run off of a Wi-Fi connection, ethernet ...