[android-developers] record incoming and outgoing calls?

Hi,

Just want to know that how to record incoming and outgoing calls on
wide varity of devices?

I am using the mediarecorder and with this i am able to record
incoming and outgoing calls with sony xperia x10 mini.
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.VOICE_CALL);

and same code doesnt work on galaxt tab.

I have googling a lot but from that it seems its not possible to
record the calls.
But i have found this link
https://market.android.com/details?id=com.killermobile.totalrecall.market

and tested it with samsung galaxy tab and sony xperia x10mini.It works
fine for both the devices.

so can anybody tell me how it can be possible to record calls with
wide variaty of devices?

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