I am developing an application where I need to implement VOIP .We are talking about connecting 2 devices using WIFI to transfer the conversation (voice).
My question is: Is there a free API or SDK that I can use in my application?
See here: http://developer.android.com/reference/android/net/sip/package-summary.html
Here is a demo application: http://developer.android.com/resources/samples/SipDemo/index.html
you can also use third-party api ( here )