The other key guideline of the IPtelephonesystem is good voice quality. It requires a series of effective quality assure measure.
IP电话系统的另一个关键指标就是能够提供较好的话音质量,这要求有一套行之有效的质量保证措施。
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In the end, the thesis gives the design of secure IPtelephonesystem, which can authenticate and authorize through RADIUS, transfer data safely through the secrecy IP phone.
The ITU-T has established the H. 323 protocol to build the media conference system, and which is widely applied in the operation of IPtelephone operation.