How to Identify and Respond to Call Bomber Attacks

**Call Bomber**, as an important variant of **SMS Bomber**, specifically targets telephone communication systems for attacks, and its harmfulness should not be underestimated. This article provides detailed information on how to identify **Call Bomber** attacks and effective protection and response strategies.

Call Bomber Attack Overview

What is Call Bomber

**Call Bomber** is an attack tool specifically targeting telephone systems, with main characteristics including:

Attack Methods

**Mass Calling**: Initiating large numbers of calls to target numbers in short periods

**Continuous Harassment**: Long-term continuous phone harassment

**Hybrid Attacks**: Combining **SMS Bombing** and call attacks

Technical Features

**High Automation**: Fully automated call attacks

**Diverse Sources**: Using multiple different calling numbers

**Time Strategic**: Selecting specific times for attacks

Differences Between Call Bomber and SMS Bomber

Different Attack Media

**Call Bomber**: Targets voice call functions

**SMS Bomber**: Targets SMS message functions

**Message Bomber**: Targets instant messaging applications

Different Impact Levels

**Immediate Interference**: Phone ringtones directly interfere with daily life

**Forced Attention**: Compared to SMS, phone calls are harder to ignore

**Resource Consumption**: Consumes more communication resources

Identifying Call Bomber Attacks

1. Attack Characteristic Identification

Abnormal Call Frequency

**High-frequency Calls**: Receiving large numbers of unknown calls in short periods

**Strong Regularity**: Call intervals show regular patterns

**Long Duration**: Attacks lasting several hours or even days

Caller Number Characteristics

**Random Numbers**: Using randomly generated phone numbers

**Foreign Numbers**: Large numbers from unknown foreign numbers

**Virtual Numbers**: Using network virtual numbers for attacks

Call Content Characteristics

**No Answer**: No one speaks after connection or automatic hang-up

**Recording Playback**: Playing pre-recorded harassment content

**Silent Attacks**: Staying silent but not hanging up

2. Technical Detection Methods

Call Record Analysis

**Frequency Statistics**: Statistics of call frequency per unit time

**Number Patterns**: Analyzing patterns and regularities of incoming call numbers

**Time Distribution**: Analyzing distribution characteristics of attack timing

Network Traffic Monitoring

**VoIP Traffic**: Monitoring abnormal VoIP call traffic

**Signaling Analysis**: Analyzing abnormal patterns in phone signaling

**Source Tracking**: Tracking real sources of attack traffic

Personal User Protection Strategies

1. Device-side Protection

Mobile Phone Setting Optimization

**Do Not Disturb Mode**: Enable intelligent do not disturb mode

**Blacklist Settings**: Establish and maintain call blacklists

**Whitelist Mode**: Only allow calls from contacts

Third-party Applications

**Call Blocking Software**: Install professional call blocking applications

**Number Identification Tools**: Use number identification and marking tools

**Real-time Protection**: Enable real-time protection functions

2. Carrier Services

Basic Protection Services

**Harassment Call Blocking**: Enable carrier harassment call blocking services

**International Call Restrictions**: Restrict international call access

**High-frequency Call Detection**: Enable automatic high-frequency call detection

Value-added Protection Services

**Intelligent Recognition**: Use AI intelligent recognition of harassment calls

**Cloud Blocking**: Perform call filtering in the cloud

**Real-time Updates**: Real-time updates of harassment number databases

3. Behavioral Response Strategies

Immediate Response When Under Attack

**Stay Calm**: Don't panic due to frequent calls

**Record Evidence**: Screenshot incoming call information

**Contact Carrier**: Immediately contact carrier for help

**Police Report**: Report to police in serious situations

Response Measures During Attack

**Temporary Number Change**: Temporarily change phone number if necessary

**Transfer Important Communications**: Transfer important communications to other contact methods

**Inform Friends and Family**: Inform friends and family of current communication difficulties

Enterprise-level Protection Solutions

1. Technical Protection Systems

PBX System Hardening

**Call Frequency Limits**: Set call frequency limits for single numbers

**Blacklist Mechanisms**: Establish dynamically updated blacklist systems

**Anomaly Detection**: Deploy abnormal call detection algorithms

Network Security Protection

**Firewall Configuration**: Configure dedicated VoIP firewalls

**Traffic Analysis**: Real-time analysis of voice traffic characteristics

**Intrusion Detection**: Deploy intrusion detection systems for VoIP

2. Management System Building

Security Policy Development

**Communication Security Policy**: Develop comprehensive communication security policies

**Emergency Response Plans**: Establish Call Bomber attack emergency response plans

**Regular Drills**: Conduct regular protection drills

Employee Training

**Security Awareness Training**: Improve employee awareness of Call Bomber attacks

**Operating Procedure Training**: Train correct response operating procedures

**Case Studies**: Learn through real case studies

3. Monitoring and Response

24/7 Monitoring

**Real-time Monitoring**: Real-time monitoring of communication system status

**Automatic Alerts**: Set up automatic alert mechanisms

**Rapid Response**: Establish rapid response teams

Collaboration Mechanisms

**Carrier Collaboration**: Establish close collaborative relationships with carriers

**Law Enforcement Cooperation**: Cooperate with law enforcement investigation and evidence collection

**Industry Sharing**: Share threat information with industry peers

Carrier-level Protection

1. Network Layer Protection

Signaling Level Control

**Call Frequency Monitoring**: Monitor call frequency from single sources

**Abnormal Pattern Detection**: Detect abnormal call patterns

**Automatic Blocking**: Automatically block suspicious mass calls

Routing Optimization

**Intelligent Routing**: Use intelligent routing algorithms to filter malicious calls

**Source Verification**: Verify authenticity of call sources

**Traffic Shaping**: Shape abnormal traffic

2. Big Data Analysis

Call Behavior Analysis

**Pattern Recognition**: Identify behavioral patterns of Call Bomber attacks

**Machine Learning**: Use machine learning algorithms to improve detection accuracy

**Predictive Analysis**: Predict possible attack trends

Threat Intelligence

**Real-time Updates**: Real-time updates of threat intelligence databases

**Multi-source Fusion**: Integrate multiple threat intelligence sources

**Sharing Mechanisms**: Establish industry threat intelligence sharing mechanisms

Technical Implementation Details

1. Detection Algorithms

Frequency Analysis Algorithm

Algorithm Steps:

Count call numbers within time windows

Calculate if call frequency exceeds thresholds

Analyze regularity of call time intervals

Comprehensively judge if it's attack behavior

Pattern Matching Algorithms

**Number Pattern Matching**: Match suspicious number generation patterns

**Time Pattern Matching**: Match abnormal time distribution patterns

**Behavior Pattern Matching**: Match typical attack behavior patterns

2. Protection Technologies

Real-time Blocking Technology

**Deep Packet Inspection**: Deep inspection of VoIP data packets

**Signaling Analysis**: Analyze SIP/H.323 and other signaling protocols

**Real-time Blocking**: Real-time blocking of detected attack calls

Intelligent Learning Technology

**Behavior Baseline Establishment**: Establish normal call behavior baselines

**Anomaly Detection**: Detect abnormal behaviors deviating from baselines

**Adaptive Adjustment**: Adaptively adjust protection strategies based on attack changes

Legal Rights Protection Guide

1. Evidence Collection

Technical Evidence

**Call Records**: Save detailed call records

**Recording Evidence**: Record harassment call content

**System Logs**: Save relevant system logs

Impact Proof

**Loss Assessment**: Assess various losses caused by attacks

**Medical Certificates**: Provide medical certificates if physical health is affected

**Work Impact**: Prove impact on work and life

2. Legal Channels

Civil Litigation

**Damage Compensation**: Require attackers to bear damage compensation responsibility

**Cease Infringement**: Require immediate cessation of attack behavior

**Public Apology**: Require public apology

Criminal Reporting

**Criminal Case Filing**: Report to police requesting criminal case filing

**Investigation Cooperation**: Cooperate with law enforcement investigation and evidence collection

**Witness Testimony**: Provide relevant witness testimony

International Cooperation and Standards

1. International Standards

ITU-T Recommendations

**Y.2770**: VoIP security requirements

**X.1051**: Network security threat information exchange

**Q.3057**: Telecommunications network security management

Industry Standards

**NIST Guidelines**: US National Institute of Standards and Technology VoIP security guidelines

**ETSI Standards**: European Telecommunications Standards Institute related standards

**3GPP Specifications**: Mobile communication system security specifications

2. International Cooperation

Law Enforcement Cooperation

**Internet Crime Treaty**: Budapest Convention on Cybercrime

**Bilateral Cooperation Agreements**: Bilateral law enforcement cooperation agreements between countries

**Multilateral Cooperation Mechanisms**: UN and other multilateral cooperation mechanisms

Technical Cooperation

**Standard Development Cooperation**: Jointly develop international technical standards

**Best Practice Sharing**: Share protection best practices

**Technology R&D Cooperation**: Joint research and development of protection technologies

Future Development Trends

1. Attack Technology Evolution

AI Technology Application

**Intelligent Voice Synthesis**: Use AI technology to synthesize realistic voices

**Behavior Simulation**: Simulate normal user call behaviors

**Adaptive Attacks**: Adaptively adjust attack strategies based on protection situations

5G Era Challenges

**Greater Bandwidth**: 5G networks provide greater attack bandwidth

**Low Latency Characteristics**: Utilize low latency characteristics for precision attacks

**IoT Expansion**: Extend attack scope to IoT devices

2. Protection Technology Development

AI Protection Technology

**Deep Learning Detection**: Use deep learning technology to improve detection accuracy

**Natural Language Processing**: Analyze call content to identify malicious attacks

**Predictive Protection**: Predict attack trends and implement preemptive protection

Blockchain Applications

**Identity Verification**: Blockchain-based caller identity verification

**Call Records**: Use blockchain technology to ensure call records are tamper-proof

**Distributed Protection**: Build distributed protection networks

Conclusions and Recommendations

Facing increasingly complex **Call Bomber** attacks, we need to establish multi-level, comprehensive protection systems:

Technical Level

**Deploy Professional Protection Systems**: Use advanced detection and blocking technologies

**Continuous Technology Upgrades**: Follow latest protection technology developments

**Strengthen Monitoring Capabilities**: Establish 24/7 monitoring mechanisms

Management Level

**Improve System Building**: Establish comprehensive security management systems

**Strengthen Personnel Training**: Improve professional capabilities of relevant personnel

**Establish Emergency Mechanisms**: Develop detailed emergency response plans

Legal Level

**Improve Laws and Regulations**: Continuously improve relevant laws and regulations

**Strengthen Enforcement**: Severely crack down on related illegal behaviors

**International Cooperation**: Strengthen international law enforcement cooperation

Social Level

**Raise Public Awareness**: Popularize Call Bomber protection knowledge

**Promote Industry Self-regulation**: Promote industry self-regulation and standard development

**Encourage Technological Innovation**: Encourage innovation in protection technologies

Only through collective efforts of society can we effectively respond to new cyber attack threats like **Call Bomber** and build a safe and reliable communication environment.

Related Resources

[SMS Bomber Protection Best Practices Guide](/en/blog/sms-bomber-protection-guide)

[2025 SMS Bomber Attack Trend Analysis](/en/blog/sms-bomber-trends-2025)

[Message Bomber and Text Bomber Technical Analysis](/en/blog/message-bomber-text-bomber-analysis)

**Disclaimer**: The content of this article is for educational and protection purposes only and is strictly prohibited from being used for any attack activities. We firmly oppose any form of cyber attack behavior.