Voice_over_IP__________________ b"b" BOOKMOBI $$ , 6c @ D D E F J6 ] # 7 MOBI d`B @ # P EXTH D e Cisco Systems, Inc. g ??????????????????VoIP ???????????????????????????????? ?????????DTMF??????????????????????????????????????????????????????? DTMF ?????????????????????????????IVR????????????????????? ????????????????????? ja d Cisco Systems, Inc. +Voice over IP ????????????????????? l 3calibre (0.8.66) [http://calibre-ebook.com] q ,0e7d2929-1d5a-41cd-8093-01a3e7e206e8 EBOK j !2022-03-04T06:00:00+00:00 t Voice over IP ?????????????????????
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