DoS Detection System for Telephone Service Delay

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Solution Overview

Problem

Existing systems fail to effectively detect and circumvent denial of service (DoS) attacks during phone call routing, which can lead to congestion and prevent legitimate users from making or receiving calls.

Innovation Solution

A DoS detection and circumvention system is implemented within the public switched telephone network (PSTN) that tracks phone calls, identifies excessive congestion by analyzing location routing numbers and carrier congestion messages, and delays calls to affected areas to prevent DoS attacks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the PSTN routes phone calls through traditional switching systems, then call connectivity is maintained, but the system becomes vulnerable to DoS attacks and congestion

Engineering Contradiction:

Improvecall connectivityVSAvoidDoS attack vulnerability

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system performs preliminary analysis of carrier congestion messages and location routing numbers before routing calls. By detecting congestion patterns in advance and analyzing LRN data beforehand, the system can identify potential DoS attacks and congested areas before they affect call routing, allowing proactive prevention rather than reactive response

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system introduces an intermediary analysis layer between the PSTN switching systems and call routing. This intermediary component analyzes carrier congestion messages and LRN data to identify DoS attacks and congestion, acting as a mediator that filters and directs calls appropriately without disrupting the underlying PSTN infrastructure

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the system delays calls to affected areas to prevent DoS attacks, then legitimate users are protected, but call setup time increases

Engineering Contradiction:

Improveprotection from DoS attacksVSAvoidcall setup time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system performs preliminary analysis of carrier congestion messages and location routing numbers to identify congested areas and potential DoS attacks before calls are delayed. By pre-processing and storing congestion data, the system can make rapid routing decisions without adding significant delay to legitimate calls

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts call routing decisions based on real-time analysis of carrier congestion messages and LRN data. Rather than applying static delays to all calls, the system adaptively routes calls around congested areas when DoS attacks are detected, while allowing normal routing when no threats are present, thus minimizing unnecessary delays

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250150529A1Telephone service delay and connection system

Publication Date: 2025.05.08 CALLFIRE

AI summary

A denial of service (DoS) detection and circumvention system is described herein. The DoS detection and circumvention system can track phone calls that are initiated and store a list of phone numbers that are called. The DoS detection and circumvention system can also track the number of carrier congestion messages over a certain time window. Using the list of called phone numbers and the tracked number of carrier congestion messages, the DoS detection and circumvention system can identify excessive congestion. If the DoS detection and circumvention system identifies excessive congestion, the DoS detection and circumvention system can delay calls so as to prevent a possible DoS condition.