SANS 332-2004 公用交换电话网络（PSTN）：包括在连接到欧洲的公共交换电话网的模拟接口时能够支撑有关服务的模拟电话机功能的终端设备的附件
Public Switched Telephone Network (PSTN); Attachment requirements for a terminal equipment incorporating an analogue handset function capable of supporting the justified case service when connected to the analogue interface of the PSTN in Europe
Specifies the technical characteristics (electrical and acoustic requirements) to be provided by a single, handset telephony terminal equipment which is intended for pan-European approval; and for connection by 2 wires to an analogue interface of a PSTN.