International Revenue Share Fraud, also known as IRSF Fraud in Telecom, is a type of telecom fraud where criminals exploit communication systems to generate large volumes of calls to premium-rate international numbers. These numbers are often linked to remote locations, satellite phones, or unscrupulous overseas partners. The fraudsters then receive a share of the high termination fees charged for these calls, leaving the victim with unexpectedly massive bills.
How Does IRSF Work?
A typical IRSF attack follows a clear pattern.
Gaining Access to the Telecom System
An IRSF attack usually begins when criminals gain access to a telecom system. Hackers exploit weaknesses in systems such as IP PBX or VoIP platforms through phishing, poor security practices, or other vulnerabilities.
Flooding the System with Calls
Once inside, the fraudsters generate thousands of fraudulent calls, targeting international premium-rate destinations to maximise revenue.
Routing Calls to Fraudster-Controlled Numbers
These calls are usually routed to numbers controlled by the fraudsters, who then receive a share of the high termination fees charged for each call.
Detecting the Fraud
The targeted organisation often only discovers the IRSF fraud when faced with enormous carrier bills. This process makes IRSF fraud highly damaging and difficult to detect without proper security measures in place.
Common Scenarios of IRSF
Fraudsters employ several methods to launch IRSF fraud in telecom networks. They often hack a company’s private branch exchange (PBX) to route international calls or target internet-based voice systems (VoIP) which may lack strong security. Some attacks involve exploiting voice one-time passwords (OTPs) to premium-rate numbers, creating fraudulent charges. Each of these strategies takes advantage of security gaps and can cause significant disruption to business communications.
The Impact of IRSF
The consequences of IRSF fraud in telecom extend well beyond financial losses.
Victims frequently face enormous, unplanned bills, network congestion from fraudulent traffic that slows or blocks legitimate calls, and reputational damage if customers lose trust in a business that suffers repeated fraud attacks.
Detection is particularly challenging because international revenue share fraud involves multiple carriers and complex routing, making tracing and stopping fraud difficult.
For many organisations, IRSF is one of the costliest types of telecom fraud.
Preventing IRSF
Stopping IRSF requires proactive monitoring and strong fraud management systems.
Real-Time Monitoring: Constantly scanning for unusual traffic patterns.
Access Controls: Securing PBX and VoIP systems against unauthorised use.
Traffic Limits: Setting thresholds for call volumes to prevent sudden spikes.
Fraud Detection Software: Using intelligent tools to identify and block suspicious activity before it causes damage.
By applying these measures, businesses can reduce their risk of becoming a victim.
Adapt IT Telecoms and IRSF Protection
At Adapt IT Telecoms, we understand the severe impact that IRSF fraud in telecom can have on organisations. Our advanced fraud management solutions combine real-time monitoring, intelligent detection algorithms, and proactive security controls to stop IRSF attacks before they cause harm. Contact Adapt IT Telecoms today to learn how we can safeguard your network against IRSF and other telecom fraud threats, keeping your business secure and your costs under control.
