Next, we investigate the approaches and procedures to set up communications with SIP protocols, and the major theory, constituents and key technologies of the SIP terminal facilities.

本文着重研究了SIP协议中通信建立的方式和过程，以及SIP终端设备的原理、构成和关键技术。

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Authentication, Authorization and Accounting (AAA) protocols such as TACACS and RADIUS were initially deployed to provide dial-up PPP and terminal server access.

认证、授权和计费(AAA)协议，如TACACS和RADIUS，当初是为了对终端访问服务和PPP拨号服务实行访问控制而开发的。

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This power load control terminal solves the problem of how to communicate with different communication protocols and provides lots of power meters which have different communication protocols.

负控终端下可以连接支持多种协议的电力终端设备，解决了兼容不同通信协议的问题。

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