How can I start videocall or phonecall on spark open fire

Hi all,

I´m trying start videocall and phone call on spark open fire, but I can´t do this very well. The plug-ins of vídeocall and phone call already install on server, user client shows plug-ins correstly, but you can´t start feature.

How can I start this features ? Anybody try install this features ?

Thanks for advance,