Based on the existing work, the paper proposes several Suggestions on system function and protocol design, including the multicast function, intelligent video technology, codec optimization, etc.

在已有工作的基础上，针对系统功能及协议设计提出了一些改进意见，包括加入多播功能、融入智能视频技术、编码器优化等。

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TTCN-3 test system specifies the standard implementation interface of codec, leaving the implementation of codec to developing engineers of protocol testing tools.

编解码器在TTCN - 3测试系统中留有标准的实现接口，具体的实现需要由开发协议测试工具的研发工程师完成。

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It is not a single but a system integrated with several technologies constructing communication network, including Signaling Protocol, Voice Codec, Media Transport and Gateway Control.

它不是单一的一种技术，而是综合了通讯网络的多种技术在内的一个系统，包括了信令协议、语音编解码、媒体传输和网关控制。

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