... of China 4) Can be input many kinds of tariff rates, such as rates of international, internal,local,free and forbidden calls5) ... With inner modem, supporting the function of network center manage,tariff atedownload and phone bill upload 10) Anti-lightning, anti- ... : on/off-hook, bill and lock/unlock.3. With various tariff rates: international call, internal call, local call, specialism call, free ...