问题
I had successfully setup the video SDK for video call if app is in foreground but having no idea how to do it when app is in background or closed.
回答1:
You need to enable Background Modes inside Capabilities in your target.
Twilio Audio will work when your application enter in background.
来源：https://stackoverflow.com/questions/45977312/twilio-video-call-in-app-background-closed-on-ios