IP电话之所以发展迅速、备受人们关注,其主要原因是IP电话能节省长途电话的费用,尤其是打国际长途电话。传统电话是通过电话网传送的,而IP电话是利用ICP/IP技术,通过因特网传送的。IP电话和 The main reason why IP telephony is growing rapidly and attracting attention is that IP telephony can save the cost of long distance calls, especially international long distance calls. Traditional telephony is delivered over the telephone network, which is delivered over the Internet using ICP / IP technology. IP phone and