SIP/PSTN gateway is a device which interworks between IP network and PSTN.
PSTN网关是实现IP网络和公用交换电话网（PSTN）互联的设备。
In addition, the transport layer allows IMS devices to make and receive calls to and from the PSTN network or other circuit-switched networks via the PSTN gateway.
此外，传输层允许IMS设备通过PSTN网关呼叫PSTN网络或其他电路交换网络和接收来自这些网络的呼叫。
Then, the design and realization of embedded PSTN gateway and audio terminal are discussed, the realization of embedded software and PSTN gateway that supports multi-terminals are emphasized.
然后对嵌入式PSTN网关和语音终端的设计和实现做了阐述，着重讨论了嵌入式软件以及支持多个终端的PSTN网关的实现；
Media gateway is used to encode and decode voice steam and connect PSTN network to the IP network.
利用媒体网关进行语音流的编解码，确保PSTN网和IP网络间的互通性；
The two key techniques-cordless telephony profile and multi-PSTN bluetooth gateway dynamic selection are studied in depth.
接着对本文的两个关键技术——无绳电话剖面以及多pstn蓝牙网关动态选择进行了深入研究。
Firstly, bluetooth technique, bluetooth protocol stack and PSTN bluetooth Gateway are introduced and the problem of the exiting PSTN bluetooth technique is analyzed in this paper.
首先介绍了蓝牙技术和PSTN蓝牙网关的概念及研究现状，分析了现有PSTN蓝牙网关存在的缺陷，并详细介绍了蓝牙协议栈。
Firstly, bluetooth technique, bluetooth protocol stack and PSTN bluetooth Gateway are introduced and the problem of the exiting PSTN bluetooth technique is analyzed in this paper.
首先介绍了蓝牙技术和PSTN蓝牙网关的概念及研究现状，分析了现有PSTN蓝牙网关存在的缺陷，并详细介绍了蓝牙协议栈。
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