ＩＰ电话是近几年来新出现的一种电信业务,由于它将平时人们使用最多的普通电话与ＩＰ网联系起来,又因为它的使用价格大大低于传统电话的价格,引起了社会各界和普通群众的广泛重视,因此ＩＰ电话已成为研究的热点之一。目前对ＩＰ电话的说法很多,设备制造商最多的说法是:Ｉ... IP telephony is a new type of telecom business that has emerged in recent years. Because it connects the most commonly used ordinary telephones to IP networks, and because its price is much lower than the price of traditional telephones, IP telephony has aroused great concern among the public As a result, IP telephony has become one of the hot spots of research. At present, there are many explanations for IP telephony, the most talked about equipment manufacturers are: I ...