PSTN网关是实现IP网络和公用交换电话网（PSTN）互联的设备。
SIP/PSTN gateway is a device which interworks between IP network and PSTN.
这种中继电路为程控用户交换机进入公用电话网提供了全自功入网能力，并易于进行程控用户交换机之间的组网。
This scheme provides the automatic trunking ability for PABX to enter the telephone network and connent with other PABX easily.
这种中继电路为程控用户交换机进入公用电话网提供了全自功入网能力，并易于进行程控用户交换机之间的组网。
This scheme provides the automatic trunking ability for PABX to enter the telephone network and connent with other PABX easily.
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