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.

youdao

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.

youdao