ETSI PRETS 300 281-1993 Integrated Services Digital Network (ISDN) Telephony 7 kHz Teleservice Terminal Requirements Necessary for End-to-End Compatibility《综合业务数字网(ISDN) 7 kHz电话电信业_1.pdf

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ETSI PRETS 300 281-1993 Integrated Services Digital Network (ISDN) Telephony 7 kHz Teleservice Terminal Requirements Necessary for End-to-End Compatibility《综合业务数字网(ISDN) 7 kHz电话电信业_1.pdf_第1页
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