Hi,
I have been working with Cisco VoIP since 2001 and Asterisk and freepbx ,trixbox, elastix since 2007.
Kindly let me know if you wanted it to be apart of freepbx ( as a module ) or a separate web application,
also do you want it to have the same functionality as VQ Plus or you need some modifications.
That being said I would like to have a little chat about your project to better understand the needs of the project
regards,