WengoPhone, more than a VoIP extension for Firefox

WengoPhone is a communication tool based on the SIP protocol, developed by the OpenWengo community and released under the GNU General Public License. It is more than just VoIP software: it is a full-fledged communications tool that lets you enjoy free calls, video conferencing, SMS, chat… Everything you need to stay in touch with your friends and family! Wengo is a VoIP provider from France, their goal is to make standards-based SIP telephony available to all.
This is the second VoIP extension provided for Firefox after we had already announced Zoep, WengoPhone looks to provide more features. I’ll give it a try, because Zoep wasn’t working correctly for me, because they don’t have setting details for proxy and firewall, while we need detailed settings to configure internet for different kind of applications.