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Can anyone help me please to find a description of the web services used by gsm operators in their billing system?
I don't think there's a book big enough. How many GSM operators are there? 300ish? I don't know, something like that - but then I give you 900 different sets of web services.
How about you start with something achievable and ask for the web services used by one specific version of one specific billing system at one specific operator? The best way to get that would be to ask the vendor.
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