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Fraud Types - Interconnect Bypass

Interconnect Bypass

What is it?

  • A carrier-specific attack


  • A customer makes a call to an international phone card
  • The call is connected and an operator routes it to a different carrier network


  • This does not directly impact the customer
  • Carrier minutes are used for fraud, not the customer's

How to start Prevention?

  • This is a type of fraud that does not impact the customer. It has carrier implications that may be passed to the customer.
  • Prevention starts with good PBX security hygiene. (passwords, CDR reviews, periodic checkups on activity on the account)

Interconnect Bypass (also known as toll bypass fraud, interconnect fraud, GSM Gateway fraud, or SIM Boxing) is the unauthorized insertion of traffic onto another carrier’s network. In this scenario, fraudsters make international calls appear to be cheaper than domestic calls, effectively bypassing the normal payment system for international calling. In Interconnect Bypass, the fraudsters will typically sell long-distance calling cards overseas. When customers call the number on the cards, operators can switch the call to make it seem like a domestic call. While this type of telecom fraud doesn’t directly impact the customer, it certainly drains carriers’ budgets.