Fraud Types
Routing international calls over the internet and re-injecting them into a local mobile network through banks of SIM cards, bypassing legitimate interconnect fees.
A SIM box holds dozens or hundreds of SIM cards. International traffic arrives over IP, then terminates as apparently local mobile calls, so the operator loses the international termination charge and the recipient sees an unrelated local number.
Detection relies on behavioural patterns: SIMs that only make calls and never receive them, no mobility across cell sites, and unnatural call duration distributions.
Beyond lost revenue, SIM box traffic destroys caller ID integrity on the terminating side and is frequently the delivery channel for scam calls.
The unauthorized use of a phone system or account to place calls that someone else has to pay for, usually to expensive international destinations.
Fraud in which criminals drive traffic to expensive international premium numbers they control and take a share of the termination revenue.
Presenting a calling number the caller is not authorized to use, in order to disguise the call's true origin or impersonate a trusted party.
SipShield scores live SIP traffic with patented AI so the controls behind this term run automatically — and leave the audit trail regulators expect.