以PCM格式记录呼叫

Question

我正在尝试使用基于SIP的VoIP编写Android应用程序（我使用SipDemo作为模板）。

我需要记录来电和去电并将其保存为PCM格式。

private static final int RECORDER_SAMPLERATE = 44100;
private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_MONO;
private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;

有可能吗？

这是来电的活动：

public class IncomingCallReceiver extends BroadcastReceiver {


@Override
public void onReceive(Context context, Intent intent) {
    SipAudioCall incomingCall = null;
    try {

        SipAudioCall.Listener listener = new SipAudioCall.Listener() {
            @Override
            public void onRinging(SipAudioCall call, SipProfile caller) {
                try {
                    call.answerCall(30);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        };

        WalkieTalkieActivity wtActivity = (WalkieTalkieActivity) context;

        incomingCall = wtActivity.manager.takeAudioCall(intent, listener);
        incomingCall.answerCall(30);
        incomingCall.startAudio();
        incomingCall.setSpeakerMode(true);
        if(incomingCall.isMuted()) {
            incomingCall.toggleMute();
        }

        wtActivity.call = incomingCall;

        wtActivity.updateStatus(incomingCall);

    } catch (Exception e) {
        if (incomingCall != null) {
            incomingCall.close();
        }
    }
}

}

呼叫录音需要什么源代码？

提前致谢！