Command Codes
In order to support Credit Control via Diameter, there are two Diameter messages, the CCR (Credit Control Request) and the CCA (Credit Control Answer). Command Code for CCR/CCA is 272, as defined in RFC 4006
For quota management the client sends CCR to the server requesting units and reporting consumption. The server grants units and charges the user. For simple debit/credit the client sends a CCR asking the server to credit/debit the user's account. For price inquiries the client ask the server what the price for a unit is, and the server responds with the price.
Read more about this topic: Diameter Credit-Control Application
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