Video Quality Change In Jitsi Meet Android SDK

Hi I am new to Jitsi Meet and Webrtc.
As of now i have successfully integrated the Jitsi meet sdk in my Android Application (In Java).
I have two configuration issues :

  1. All my conference calls from mobile are in 720p or HD format, how to optimize and reduce quality for that.
  2. Even after ending the conference call if a user try to make a phone call or jitsi meet call app shows
    alert dialog. “This call will end Your Call “My Application Name” .”

Kindly help me to resolve above mentioned issue . Thanks in advance.