Get started with VoIP [closed]

Question

Are there any available api's in android for voice chat? What do we need to do exactly in the backend? Every where i could see information about the front end? No idea how it works in the backend? Do I need a SIP server? How to configure it? What will be its price?

Answer 1

Starting APi Level 9, native SIP support was added to the framework which facilitates VoIP. http://developer.android.com/reference/android/net/sip/package-summary.html

Here is a demo app: http://developer.android.com/resources/samples/SipDemo/index.html