1. Move audio recorder and player to the application.
2. Patch through SDK to allow application to access audio/video.
3. Buffer/replicate/record data in the application.

Address 3 issues:
1. Need repeat (solution: receiver can replay the messages).
2. Chatty messages, cannot focus (solution: pause the audio and play later).
3. Difficult to synchronize (solution: async-sending).

	+GMS
	+CMS
	+IdMS
	+Chat Group Calls
	+Full-duplex call (without floor control)
	+Emergency Group and private calls
	+Automatic commencement mode
	+Multiple errors fixed