VoIP Security • SIP Firewall • No AI

Carrier-grade SIP firewall that stops fraud before it reaches your core.

SIPDefender protects SIP infrastructures against flooding, brute-force attacks, toll fraud, and unauthorized registrations — with deterministic policies, rate limits, and secure transport enforcement.

SIP-aware L7 rules Rate limiting IP reputation TLS/SRTP enforcement

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Deterministic rules • Audit-friendly logs • Deploy at the edge (provider or enterprise)

Security Overview

Today (sample dashboard)

TLS Enforced

12,438

Requests screened

1,204

Blocked threats

34

Quarantined IPs

Live security activity

Sample events

Sample events (deterministic rules)

Enforcement: ON

SIP Flood detected

INVITE burst: 1,200/min • Edge trunk

Blocked

Brute-force throttled

REGISTER failures exceeded threshold

Quarantined

Top action

Quarantine IP

30 min • Auto-expire • Logged

Most blocked method

INVITE

Flood/scan patterns

Use navigation

Threat Coverage

Block the most common SIP attacks that cause outages and losses.

Built for real-world VoIP abuse patterns — not generic packet filtering.

SIP Flooding

INVITE/REGISTER storms, scans, malformed SIP bursts.

Outcome: throttling + quarantine + clean upstream traffic.

Brute-Force

Credential stuffing, user enumeration, auth failure spikes.

Outcome: blocklists, per-identity limits, adaptive thresholds.

Toll Fraud

Premium routes, international spikes, risky prefixes.

Outcome: destination policies, caps, and route restrictions.

Unauthorized Regs

Endpoint hijacks, re-register loops, spoofed UAs.

Outcome: identity constraints, realm policies, and lockouts.

SIP Firewall & Policies

SIP-aware rules you can actually control.

Build policies around SIP methods, headers, URIs, user-agents, and identities. Enforce rate limits per IP, account, endpoint, or method — with predictable outcomes.

Rule Builder

Match: From/To/Contact, Call-ID, UA, realms, methods.

Rate Limiting

Burst + sustained thresholds; per-entity granularity.

Reputation & Lists

Allow/deny lists + feeds; optional ASN controls.

Actions

Allow, block, throttle, quarantine, tarpitting.

Sample Policy

Example of a SIP-aware rule (illustrative)

IF

REGISTER from unknown IP reputation feed

AND auth failures > 6 in 60s

THEN

Quarantine IP for 30 minutes

Log event + trigger webhook alert

Deterministic policies — no black-box decisions.

Secure Transport

TLS/SRTP enforcement for secure-by-default VoIP.

Harden signaling and media with explicit policies — plus registration controls and SIP normalization.

TLS for Signaling

Enforce TLS-only (reject plaintext)
Minimum versions/ciphers (policy-based)
Certificate management workflows

SRTP for Media

Require SRTP (block RTP-only)
Interop profiles for trunks/endpoints
Media policy validation

Registration Controls

Realm restrictions & TTL limits
Per-device/account constraints
Lockouts & challenge flows

Audit logs RBAC Header redaction (optional) Signed rule packs

Pricing

Predictable pricing for SIP security.

No “AI credits”. License by deployment size.

Starter

Labs & small deployments

€99 /month

Up to 500 concurrent calls
Core SIP firewall rules
Basic rate limiting
Dashboard overview

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Professional

Providers & enterprises

€399 /month

Up to 5,000 concurrent calls
Toll-fraud policies
TLS/SRTP enforcement
IP reputation feeds
Alerts + log export

Request Professional

Enterprise

Carrier-grade & HA

Custom

Unlimited scale (multi-node)
HA deployments + SLA options
Custom rules & feeds
SIEM integrations
Priority support

Talk to Sales

Notes: No per-user fees • Annual discounts available • Evaluation deployments supported • Pricing shown is illustrative.

Deployment & Contact

Deploy at the edge in minutes.

SIPDefender can run as an edge gateway/inline proxy in front of your PBX, SBC, or softswitch. Start in monitor mode, then enforce policies when you’re ready.

Deployment Modes

Inline proxy • Edge gateway • Monitor-first rollout

Visibility

Real-time counters • Exportable logs • Alerts

Trust

Deterministic policies • RBAC • Audit trails

Compatibility

PBX • SBC • SIP Trunks • UC platforms

Request a Demo

We’ll respond with a deployment plan and a trial option.