20 Oct SIP Protection for VoIP: Security for Businesses

In the landscape of modern business communications, VoIP (Voice over IP) systems have revolutionized the way companies manage their telecommunications.

VoIP communications based on the SIP protocol represent a critical infrastructure for thousands of Italian companies. In fact, not all providers offer SIP protection for VoIP PBXs. While most providers focus on traditional DDoS protection, a crucial aspect is often overlooked: specific VoIP protection for the SIP protocol.

Unlike traditional business telephones, VoIP phones and IP phones use an Internet connection to transmit VoIP calls, eliminating the need for expensive dedicated phone lines.

A virtual PBX based on Voice over IP (VoIP) technology offers unprecedented flexibility in call management, allowing companies to configure queues, IVRs, recordings, and CRM integrations without relying on third parties for configuration changes.

However, security remains an absolute priority: implementing end-to-end encryption to protect corporate conversations is essential, as is choosing a reliable VoIP service that guarantees protection against attacks specifically targeting the SIP protocol.

The choice of the right virtual phone system, combined with a protected server infrastructure, determines not only the quality of communications but also the security and operational continuity of the entire company.

What Is the SIP Protocol and Why It Requires Specific Protection

The Heart of Modern VoIP Communications

SIP (Session Initiation Protocol) is the standard protocol used to initiate, maintain, and terminate real-time communication sessions, including voice calls and video calls. It is the technological foundation of:

• Corporate VoIP PBXs (IP PBX)
• Cloud telephony services
• Contact center and call center systems
• Unified communications applications
• Enterprise video conferencing services

Unlike traditional web traffic, the SIP protocol has unique characteristics that make it particularly vulnerable to specific attacks. The real-time nature of VoIP communications means that even short interruptions or quality degradations have an immediate and visible impact on business operations.

There is a growing trend in searches for “VoIP PBX hosting” and “VPS for VoIP PBX,” with many believing this alone guarantees stability and protection.

SIP Protection for VoIP PBXs: Why Traditional DDoS Protection Is Not Enough

Many companies mistakenly believe that generic DDoS protection is sufficient to protect their VoIP PBX. However, SIP attacks have specific characteristics that require dedicated filters:

• Low volume but high impact: SIP attacks can be effective even with relatively low traffic, making traditional volumetric thresholds ineffective.
• Application-layer protocol: SIP operates at the application level (Layer 7), requiring deep traffic analysis.
• Sensitivity to latency: Even small delays introduced by generic protection systems can degrade call quality.
• Specific ports and patterns: SIP attacks use standard ports (5060, 5061) and traffic patterns that must be specifically recognized and handled.

Specific Threats to the SIP Protocol

SIP Flood: The Number One Enemy of PBXs

SIP flood attacks represent the most common and devastating threat to VoIP PBXs. These attacks consist of sending massive amounts of SIP requests (typically INVITE, REGISTER, or OPTIONS) that overload the VoIP server:

• Immediate impact: The PBX becomes unreachable within seconds.
• Total communication blockage: Inability to make or receive calls.
• Exhausted resources: CPU and server memory saturated by malicious requests.
• Difficult to mitigate: Without specific filters, distinguishing legitimate traffic from attacks is complex.

The Servereasy Solution: Advanced SIP Protection for Cloud VPS

VoIP PBX Security Filters: Protected VoIP Server

We are one of the few Italian providers to offer security filters specifically designed for VoIP and SIP traffic. This dedicated protection includes:

Intelligent SIP Flood Blocking

Our protection system identifies and blocks SIP flood attempts in real time:

• Behavioral analysis: Detection of abnormal patterns in SIP requests.
• Dynamic rate limiting: Automatic limitation of requests from suspicious sources.
• Smart whitelist: Machine learning of legitimate traffic patterns.
• Selective blocking: Only malicious traffic is filtered, keeping the service operational.

Advanced Protection Against Brute Force

Our filters implement sophisticated mechanisms to prevent brute-force attacks:

• Fail2ban optimized for SIP: Automatic blocking after failed authentication attempts.
• Smart geo-blocking: Limiting registrations from high-risk countries.
• Two-factor authentication: Support for two-factor authentication on SIP registrations.
• Real-time alerting: Immediate notifications in case of suspicious attempts.

Real-Time UDP and TCP Mitigation

The protection operates simultaneously on both transport protocols:

• Stateful inspection: Deep analysis of the state of connections.
• Protocol validation: Verification of packet compliance with SIP standards.
• Bandwidth management: Intelligent bandwidth management to prevent saturation.
• Connection tracking: Connection monitoring to identify anomalies.

Maintaining Call Quality

Unlike generic solutions that can introduce latency, our filters are optimized for:

• Minimal latency: Packet processing in <1ms.
• Reduced jitter: Stable audio quality even during attacks.
• Packet loss prevention: Prioritization of legitimate RTP traffic.
• Integrated QoS: Quality of Service to ensure consistent performance.

Servereasy Cloud VPS: The Ideal Infrastructure for VoIP

Technical Features Optimized for VoIP

Servereasy Cloud VPS are specifically configured to deliver optimal performance for VoIP applications:

All plans include:

• Latest generation AMD Epyc processors
• NVMe RAID10 storage for maximum performance
• Included Always-ON DDoS protection
• Dedicated SIP filters included
• Automatic daily backup (7-day retention)
• 24/7 technical support

Specialized Technical Consulting

The Servereasy technical team offers specialized 24/7 consulting.

Uptime and Continuity for Mission-Critical Services

SLA and Availability Guarantees

For business communications, uptime is non-negotiable. Servereasy guarantees:

• 99.9% uptime: Documented SLA with compensation in case of downtime.
• Redundant datacenter: Dual power supply, redundant switches, redundant cooling.
• 24/7 monitoring: Automatic anomaly detection systems.
• Rapid response: Technical team available 24/7 for emergencies.
• Automatic daily backup: Included in all VPS plans.
• 7-day retention: Ability to restore up to 7 days prior.

Our Cloud VPS combine latest-generation hardware (AMD Epyc, NVMe RAID10), high-quality connectivity (AS60798, Tier 1 carriers), and advanced protection (Always-ON DDoS + dedicated SIP filters) at extremely competitive prices starting from only €5/month.

Do not let a SIP attack block your company’s communications. Protect your VoIP PBX with the most advanced solution available on the Italian market.

Staff Servereasy