How to set iceservers in openfire

hi,

Into the openfire management interface,Server->Jitsi Videobridge->jitsi Videobridge Settings Page,how to set iceServers.

I was so set ,the iceServers uses the open-source,

ICE Servers   [{ "url": "stun:stun.l.google.com:19302" }],

but there is no videos between two clients

can the turnserver been used in jitsi in openfire?