VFDIAL Voice Frequency DIALing 音频拨号
voice frequency dialing 话频拨号 ; 语频拨号
VFD Voice Frequency Dialing 音频拨号 ; 话频拨号
voice frequency dialing equipment 话频拨号设备
VFDE Voice Frequency Dialing Equipment 音频拨号设备
voice e frequency dialing 语频拨号
voice frequency toll dialing 音频长途拨号方式
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