"The OpenWengo project recently released version 2.1 of its WengoPhone VoIP softphone. It's a big step forward for Linux users.
"Wengo--the commercial PSTN-routing SIP provider that is the open source project's parent company--focused on its Windows builds and essentially skipped over Linux during the 2.0 release cycle. OpenWengo's Linux developers were never satisfied with the stability of the 2.0-series release candidates, so they never incremented the Linux version number to 2.0..."