V

Value Added Services, 235

VC (Virtual Circuit), 321

VCI (Virtual Circuit Identifier), 321

VE-2 interface, 75

Vendor-specific content (FLAP), 59, 261–262

V-interface (DSL), 139

Virtual cell identifiers, 203

Virtual Circuit (VC), 320

Virtual Circuit Identifier (VCI), 321

Virtual LAN (VLAN):

defined, 321

and DHCP, 166–168

in DSLAM networks, 139

layer-2 forwarding, 158–168

and PPP, 162–164

RADIUS ALE in, 161–162

and service provider segment, 158–162

Virtual Path Identifer (VPI), 321

Virtual Private Network (VPN), 121–124

defined, 321

and IP mobility, 193

law enforcement use of, 246

Visitor location register (VLR), 236, 247

VLAN (see Virtual LAN)

VLR (see Visitor location register)

Voice over Internet Protocol (VoIP), 13–17

in cellular networks, 203

defined, 321

and Enhanced 911 services, 13–15

history of, 13–14

i2 architecture for, 15–17

Internet Services Model for, 14

nomadicity/mobility of, 14–15

organizational aspects of, 16

Voice Service Provider (VSP):

defined, 321

on STUN server, 92

in wireless networks, 208, 209

VoIP (see Voice over Internet Protocol)

VoIP Position Center (VPC):

defined, 17, 320

enterprise relationships with, 131

GMLC and, 16

role of, 17

VPC (see VoIP Position Center)

VPI (Virtual Path Identifer), 321

VPN (see Virtual private network)

VSP (see Voice Service Provider)