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VoIP & SIP security

VoIP Penetration Testing Methodology

A structured, PTES-aligned 6-phase VoIP assessment — systematically evaluating SIP, H.323, MGCP, and RTP infrastructure for the vulnerabilities that lead to toll fraud, eavesdropping, and call manipulation.

Phase 1

Planning & Reconnaissance

Define the scope

Define scope, identify VoIP infrastructure components, and gather preliminary information about the target system.

Infrastructure mapping
SIP service discovery
OSINT
Phase 2

Enumeration

Discover devices & extensions

Discover SIP devices, enumerate extensions, identify protocols (SIP, H.323, MGCP, RTP), and map call flow.

SIPVicious (svmap/svwar)
nmap-sip
Extension enumeration
Phase 3

Vulnerability Assessment

Find the weaknesses

Test for VoIP-specific vulnerabilities including registration hijacking, weak authentication, codec issues, and VLAN hopping.

nuclei-voip
Registration / auth checks
TLS-SIPS / SRTP checks
Phase 4

Exploitation

Prove the impact

Controlled exploitation of identified vulnerabilities including call hijacking, eavesdropping, and toll-fraud testing — within authorization scope.

svcrack (authorized brute)
Hydra (SIP)
Call-manipulation tests
Phase 5

Post-Exploitation

Measure the impact

Assess business impact, document data-exposure risks, compliance violations, and potential financial losses from toll fraud.

Impact assessment
Toll-fraud exposure
Data-exposure analysis
Phase 6

Reporting

Make it actionable

Comprehensive report with executive summary, technical findings, risk ratings, proof of concept, and remediation recommendations.

Risk-scored findings
Remediation guidance
PDF / web / DOCX reports

Standards we map to

Every finding is tagged against the frameworks your compliance team actually uses.

NIST SP 800-58 (VoIP)
PCI-DSS v4.0
ISO/IEC 27001:2022

A note on authorization

Every active test requires either attested ownership of the target during signup or an explicit written authorization on file. We log every test request against this authorization so there's never any ambiguity about scope — we are bound by the same Computer Misuse legislation our customers are.

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