ETSI TR 101 079-1997 Network Aspects (NA) Routeing of Calls to Pan-European Services Using European Telephony Numbering Space (ETNS) (V1 1 1)《网络方面(NA) 采用欧洲电话编号区间(ETNS)的泛欧业务的呼叫线路(版本_1.pdf

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