"AAA" is an acronym that rings familiar to all old hands of telecommunication since time immemorial. Particularly, is the base itself of businesses like PSTN carriers, but also to Internet Providing since the early days of dialup modems.
Simply put, AAA is the whole operation of:
* Authentication - knowing an user is actually who he is declaring to be (eg: login and password do match)
* Authorization - knowing what "rights" that user has (eg: he can call national and international numbers, excluded premium and for-pay numbers)
* Accounting - knowing what the user has just done and his history (eg: he started with a credit of 835 units, and the call just finished is rated 35 units)
As you can see from this souped-up definition (google around for better ones), AAA is a pretty abstract requirement, one that can be...
