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Variable bit rate (VBR), 232
Vendor and carrier services, 394–95
Very low bit rate voice (VLBRV), 195
Very small aperture terminals (VSATs), 377
Virtual Connection Services (VCS), 172
Virtual private networks (VPNs), 108, 158–64
advantages, 159–60
architecture, 160–61
automatic number identification (ANI), 162
billing options, 162–63
defined, 158
exchange number sharing, 162
features, 161–62
flexible routing, 162
history of, 159
local, service, 164
location screening, 162
network management, 163–64
originating call screening, 162
partitioned database management, 162
SDNs, 159, 160, 161
service providers, 160
vulnerability, 318
Viruses
multiplier effect, 319
protection, 318–20
scanning, 41–42
threat of, 319
Visio Professional, 345
VisualSAN, 89–90
Performance Manager, 90
VisualSAN Network Manager, 89–90
Voice compression, 194–95
Voice over ATM gateways, 118
Voice over frame relay (VoFR), 109, 230–31
Voice over IP (VoIP), 100
Voice systems
call detail reporting, 164–70
centralized vs. distributed, 156–58
Centrex, 177–81
historical perspective, 149–52
IP PBXs, 170–72
managing, 149–82
PBX components, 152–56
VPNs, 158–64
wireless PBX, 172–77
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