TETRA协议是欧洲电信标准协会(etsi) 1998年公布的一种数字集群通信系统标准。
In 1998, ETSI publicized TETRA protocal, which is a standard of digital trunked radio communication system.
本文主要根据欧洲电信标准(etsi)的有关侦听标准，对无线通信系统、基于SIP的VOIP系统和IP网络的合法侦听进行了研究。
The article, depending on the interception standard of ETSI standard, studies the interception of the wireless telecommunications, VOIP system based on SIP and IP network.
本文主要根据欧洲电信标准(etsi)的有关侦听标准，对无线通信系统、基于SIP的VOIP系统和IP网络的合法侦听进行了研究。
The article, depending on the interception standard of ETSI standard, studies the interception of the wireless telecommunications, VOIP system based on SIP and IP network.
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