[摘要] 文章以传统电话经由Internet传输的话音通信为例,阐述了IP电话的基本原理,给出了相关协议,并指出存在的问题。
[关键词] IP电话 网关 网闸
[Abstract] By taking two regular phones through the Internet to carry out voice communication as an exam-ple,the paper introduces the prima-ry principles of the Internet Phone(IP) and its correlated protocols,and ends up with some existing technical problems with IP.
[Keywords] Internet phone Gateway Gatekeeper