DIN ETS 300145:1996 综合服务数字网(ISDN).音频视频服务.在一或二个64千字节/秒频段上运行的可视电话系统和终端
Integrated Services Digital Network (ISDN) - Audiovisual services - Videotelephone systems and terminal equipment operating on one or two 64 kbit/s channels; English version ETS 300145:1996