I was able to use fring to video call using the front camera also.
All you gotta do is close fring and go to camera and select the option to use front camera and then viola fring
will use the front camera, until you select the back camera again.
All you need to do it fire up Fring, then quit it , open the camera and switch to the front facing camera, and then reopen Fring, Voila Video calls will
Note : if Video calls don’t work : jump into bring settings and make sure video calls is ticked. Thats all , we tested it and it works fine.