V

vendors , 385

virtual LANs. See VLANs

Virtual Network Computing (VNC), 239240

virus oversubscription effect, 134

viruses, 134, 244245

VLAN hopping , 247

VLAN segmentation, 353

VLAN tagging protocol, 154

VLAN Trunking Protocol (VTP), 156, 247

VLANs (virtual LANs)

ARP spoofing and, 184

circumventing, 154156

DoS and, 413, 425426

eavesdropping attacks and, 120

flooding and, 136

members of, 154

nested, 155

port scanning and, 47

private, 155

SIP systems, 434, 466, 479480

VLT (Virtual LAN Trunk), 154

VNC (Virtual Network Computing), 239240

VNCrack tool, 239

vocoders, 65

voice CAPTCHAs, 502503

Voice over IP. See VoIP

voice phishing, 505516

voice SPAM, 484, 487504

voicemail

Asterisk, 344345, 349

AUDIX, 314

Cisco Unity, 217

SPIT and, 491

VoIP (voice over IP)

automated attendant feature, 16

call quality, 122130

latency, 123

quality measurement appliances, 129130

vulnerabilities, 2

VoIP devices. See devices

VoIP eavesdropping. See eavesdropping attacks

VoIP endpoints, 150

VoIP fuzzing, 369387. See also fuzzing

buffer overflows, 372373

commercial tools for, 384385

countermeasures, 386

disclosing results from, 385

format strings and, 373374

reasons for, 371372

references, 386387

vulnerabilities, 372383

VoIP interception/modification.     See interception attacks

VoIP networks. See networks

VoIP phones. See phones

VoIP security pyramid, 810

VoIP SIP environment, 3031

VoIP vendors, 18, 371

VoIPaudit tool, 71, 73

voipong tool, 158, 162

VoIP/SIP firewalls, 480

vomit tool, 162

VTP (VLAN Trunking Protocol), 156, 247

VTP transparent mode, 247

VxWorks remote debugger, 113116

VxWorks VoIP devices, 113116