For the purpose referred to in Article 6(2) the following data may be processed:
Data containing the:
- number or identification of the subscriber station,
- address of the subscriber and the type of station,
- total number of units to be charged for the accounting period,
- called subscriber number,
- type, starting time and duration of the calls made and/or the data volume transmitted,
- date of the call/service,
- other information concerning payments such as advance payment, payments by instalments, disconnection and reminders.