DIN EN 300267-2:2001
综合业务数字网(ISDN)."7 kHz电话服务"、"可视电话服务"、"视听服务"和"电视会议服务".数字用户用1号信令系统协议(DSS1).第2部分:协议实现一致性声明形式规范
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 (P