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Videotelephony / Ringback tone / Ringtone / Signal tone / Intelligent Network / Signalling System No. 7 / Dial tone / Hong Kong Tourism Board / ITU-T / Telephony / Electronic engineering / Signaling System 7


HKTA 3210 ISSUE 2 OCTOBER 2000 STANDARDISATION GUIDE FOR PROVISION OF TONES AND
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Document Date: 2012-03-29 22:39:12

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