VAC Voice Activity Compression (detta anche DSI) VAD Value-Added Dealer VAN Value-Added Network VAR Value-Added Reseller VAS Value Alignment Service VB Visual Basic VBR Variable Bit Rate (ATM) VBX Visual Basic eXtensions VC Virtual Circuit VCx Virtual Container x (SDH) VCC Virtual Channel Connection (ATM) VCI Virtual Channel Identifier (ATM) VCO Voltage Controlled Oscillator VD Virtual Definition VDT Video Dial Tone VES Video-Enforcement System VF Virtual Frequency VHDL VHSIC Hardware Description Language VHF Very High Frequency VHSIC Very High Speed Integrated Circuit VIEW Virtual Interactive Environment for Workshops VIM Vendor Independent Messaging interface (e-mail) VIP Video Information Provider VISTA Video Information Services Terminal Access VLR Visitors Location Register (GSM) VMS Voice Messaging System VOD Video-On-Demand VoIP Voice Over IP VPI Virtual Path Identifier (ATM) VPN Virtual Private Network VPX Virtual Path Cross-Connect VRML Virtual Reality Markup Language VS Virtual Source VSAT Very Small Aperture Terminal VSB Vestigial Side Band VTAM Virtual Telecommunications Access Method VVC Virtual Visual Center