How operators charge each other when subscribers roam or calls cross networks: data exchange files, clearing houses, settlement and fraud control.
When a subscriber uses a partner's network abroad, the visited operator records the usage and sends it to the subscriber's home operator, which charges its customer. The visited operator then invoices the home operator at the agreed wholesale rate. The same pattern applies to interconnect: when a call crosses from one network to another, the operators settle between themselves.
Billing systems therefore handle two flows: retail rating of the subscriber's usage, and wholesale accounting of what is owed to or by each partner.
Typical flow between a visited and a home operator.
The visited network records calls, SMS and data sessions for the inbound roamer.
Records are grouped per partner into transferred account files and sent through a data clearing house.
The home operator validates the files; errors are returned in a returned account file for correction.
Valid records are rated against the subscriber's roaming plan and shown on the bill or deducted from the balance.
Wholesale amounts are aggregated, invoiced and netted through a financial clearing house.
The standard file formats for exchanging roaming usage and rejected records between operators.
Summary records sent within hours so the home network can spot high-cost fraud quickly.
Third parties that route files, convert formats and net payments between hundreds of partners.
Inter-operator tariffs, discounts and volume commitments, applied separately from retail plans.
Thresholds per subscriber and per partner, with alerts and automatic barring.
Directing roamers to preferred partner networks with better commercial terms.
Detect bypass, SIM-box and high-usage fraud from near-real-time records in minutes, not days.
Match billed and expected wholesale volumes and flag discrepancies automatically.
Forecast roaming volumes per partner to negotiate better wholesale deals.
This page describes generic industry practice and public standards. It is not based on, and does not describe, any particular vendor's product or operator's systems.