Our company, ChoiSecu, make Telesecurity (Anti-phone tapping) device in Korea. We have been developing Audio Signal Processing Technology for 14 years and launched Voice Channel Encryptor called "VoCE" for phone security. Since this device is based on analog variable synthesis with Diffie-Hellman key exchange method, it can prevent users from getting tapped by any method, even super computer. Moreover, it works pretty well in any area, any carrier and any kind of cell phone because it is not processed by data network but audio communication network with Bluetooth. We'd done with quality test in Latin America (Mexico Police, Headquarters of security in Colombia, Peru) and a lot of Asian countires having the best feedback from users.