NF Z82-082-1995 Integrated Services Digital Network (ISDN) 3 1 kHz telephony teleservice Ent-to-end compatibility requirements for telephony terminals 《综合服务数字网络(ISDN) 3 1kHz电话电信服务 .pdf

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NF Z82-082-1995 Integrated Services Digital Network (ISDN) 3 1 kHz telephony teleservice Ent-to-end compatibility requirements for telephony terminals 《综合服务数字网络(ISDN) 3 1kHz电话电信服务 .pdf_第1页
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