ETSI EN 300 267-2-2000 综合业务数字网(ISDN).7khz电话,可视电话,声像会议和视频会议电信业务.1号数字用户信令系统(DSS1)协议.第2部分:协议实现一致性声明(PICS)形式规范 ?
Integrated Services Digital Network (ISDN); Telephony 7 kHz, Videotelephony, Audiographic Conference and Videoconference Teleservices; Digital Subscriber Signalling System No. One (DSS1) Protocol; Part 2: Protocol Implementation Conformance Statement (PIC