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Internet telephony consists of a combination of hardware and software that enables you touse the Internet as the transmission medium for telephone calls. For users who have free,or fixed-price Internet access, Internet telephony software essentially provides freetelephone calls anywhere in the world. In its simplest form, PC-to-PC Internet telephonycan be as easy as hooking up a microphone to your computer and sending your voicethrough a cable modem to a person who has Internet telephony software that iscompatible with yours. This basic form of Internet telephony is not without its problems,however. Connecting this way is slower than using a traditional telephone, and thequality of the voice transmissions is also not near the quality you would get when placinga regular phone call.

互联网电话（Internet telephony）是硬件与软件的结合体，可将互联网作为电话通话的传输媒介。对于拥有免费或固定费用互联网接入服务的用户而言，互联网电话软件本质上可实现全球任意地点的免费语音通话。其最简形式为PC到PC的互联网通话，操作流程极为简便：只需将麦克风接驳至计算机，再通过线缆调制解调器（cable modem）将语音传输至安装了与你所用软件兼容的互联网电话软件的用户。不过这类基础形式的互联网电话并非毫无缺陷：此类连接方式的速率慢于传统电话，且语音传输质量也远不及常规电话通话的音质。