Adding chat and VOIP calls functionality?

It is part of the latest Android 2.3 release See developer.android.com/sdk/android-2.3.html developer.android.com/resources/samples/....

If you wish to develop for prior 2.3 (or just your own VoIP engine), you use the AudioTrack and AudioRecord APIs for streaming recording\playback. If the question was more specific I could provide more detailed answers.

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