Smack support for audio/video chat with google Chat client

I developed a client using smack, smackx & smackx-jingle API (3.2.1) for audio chat. Google has started support for XEP-166 and XEP-167 in audio/video chat from Gmail browser chat client. I am trying with the same. After some tweaking I was able to establish signaling but facing some issues in audio streaming and STUN packets handling.

Has anybody tried Google audio/video chat using smack API ?

how one can configure two IP of STUN server in smack API?