windows phone 7 - Microphone not working when a call occures -

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i m trying record voice using microphone api in wp7/wp8. every thing working fine when use record normal voice, when use when call answered application running well. when playback recorded voice whole recording empty, there no sound @ all.

what happened microphone in case?

here code m using

  microphone.bufferduration = timespan.frommilliseconds(100);   microphone.start();           void micro_bufferready(object sender, eventargs e)         {              audiobuffer = new byte[microphone.getsamplesizeinbytes(microphone.bufferduration)];             microphone.getdata(audiobuffer);                            currentrecordingstream.write(audiobuffer, 0, audiobuffer.length);                  }

you can't record call microphone in app. when call activated, call app on phone take control of microphone , sound directed it, not application.


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