WengoPhone is a multi-platform VOIP client
sponsored and developed by WENGO and MBDSYS. The
GUI part is Qt-based, and the Video-over-IP engine
is based on the eXosip, oSIP, oRTP, and ffmpeg
projects. The eXosip module is extended by a phApi
module, which implements a high-level, easy-to-use
call control API. WengoPhone supports PC-to-PC
voice, video, and chat. One can use a standard SIP
service provider such as Wengo to be assigned an
incoming number, make calls to PSTN/cell phones,
get voice mail, and more.