通过 Internet 打电话(IP Phone 或称网络电话)有许多优点:它的费用低;若是计算机到计算机的 IP phone 不必另加电话装置,使用计算机的多媒体组件即可;由于它基于数字音频技术,因此有可能在电话产品上附加一些诱人的特性:如指出通话对方的电子邮件的地址、进行复杂的安全加密使偷听 Calling over the Internet (IP Phone or Internet Phone) has many advantages: it’s low cost; if it’s a computer-to-computer IP phone, it’s not necessary to add a phone device to use the computer’s multimedia components; because it is based on digital audio technology, It is possible to add some tempting features to the phone product: pointing out the address of the other party’s e-mail, complicating security encryption to eavesdrop