[视频通话]无法回想起视频聊天

I create a CallActivity implement Video Call webrtc. I use quickblox sdk version 2.2.2. The Video Call work fine. But when i ended a Video Call and finish() CallActivity, then i restart CallActivity again, the Video Call not work any more, i can start a new Video Call, but my partner can not receive this Call. I must force stop my app by app manager, Video Call work fine again. Maybe the video call session has problem! How to recall when restart CallActivity. My destroy() method on CallActivity.I create a CallActivity implement Video Call we