A terrestrial trunked radio gateway includes a conference server configured to perform switching of audio input from a voice over internet protocol (VoIP) phone. The terrestrial trunked radio gateway further includes a pulse code modulation (PCM) driver that inserts an algebraic codebook excited linear prediction (ACELP) voice data for transmission to tetra network. A user agent server (UAS) or a user agent client (UAC) connects to the VoIP phone via a VoIP network. An an access net gateway (AGW) functions as an access net common application programming interface (ACAPI) client communicating with an access net common application programming interface (ACAPI) server. The terrestrial trunked radio gateway works as a signaling gateway and allow communication between the VoIP phone and a mobile radio terminal. The VoIP phone uses a built-in algebraic codebook excited linear prediction (ACELP) codec to convert voice captured into the ACELP formulated data before transferring to tetra gateway.
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机译：地面集群无线电网关包括一个会议服务器，被配置为从互联网协议（VoIP）电话的语音执行音频输入的切换。地面集群无线电网关还包括脉冲代码调制（PCM）驱动器，该驱动器插入用于传输到TETRA网络的代数码本激励线性预测（ACELP）语音数据。用户代理服务器（UAS）或用户代理客户端（UAC）通过VoIP网络连接到VoIP电话。 Access Net Gateway（AGW）用作访问NET通用应用程序编程接口（ACAPI）客户端与Access Net常见应用程序编程接口（ACAPI）服务器通信。地面集群无线电网关用作信令网关，允许VoIP电话和移动无线电终端之间的通信。 VoIP电话使用内置的代数码本激励线性预测（ACELP）编解码器将捕获的语音转换为ACELP的配方数据之前传输到TETRA网关。
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