Keyguard: do not play sounds while phone call is active

            // If music is playing, don't play the sound

            if (mAudioManager.isMusicActive()) return;

            // If user is in a call, don't play the sound

            TelephonyManager tm = (TelephonyManager) mContext.

                    getSystemService(Context.TELEPHONY_SERVICE);

            if (tm != null  && (tm.isOffhook() || tm.isRinging())) {

                return;

            }

            mLockSoundStreamId = mLockSounds.play(whichSound,

                    mLockSoundVolume, mLockSoundVolume, 1/*priortiy*/, 0/*loop*/, 1.0f/*rate*/);

        }