ofmeet plugin runs ok, but have no sound. and i wonder whether i can use this running in my own android app?

I user openfire1.10.0 and only add ofmeet plugin to the server,

Jitsi Meet runs this ok, but cannot hear any sound. and sip cannot use either. Anybody met this problem?

And one more question, I want to use the meetting function to run in my own Android APP, how to use this plugin?

Thank you all.