Podcast
Questions and Answers
Charging depends on many ______
Charging depends on many ______
factors
The MSC to which handles the call collects all information which could be the basis for ______
The MSC to which handles the call collects all information which could be the basis for ______
charging
This collected information of the call is stored in Charging Data Records (CDR) Charging data records are stored in the MSC where they are ______
This collected information of the call is stored in Charging Data Records (CDR) Charging data records are stored in the MSC where they are ______
collected
CDRs must be kept at the first MSC which manages the ______
CDRs must be kept at the first MSC which manages the ______
When sufficient charging data records have been collected, they are transferred in one bulk to the ______ Center
When sufficient charging data records have been collected, they are transferred in one bulk to the ______ Center
Billing Center is responsible for producing the bills for the subscribers based on the information contained in the Charging Data ______
Billing Center is responsible for producing the bills for the subscribers based on the information contained in the Charging Data ______
Each subscriber has authentication keys, Ki, stored in the Authentication center and SIM ______
Each subscriber has authentication keys, Ki, stored in the Authentication center and SIM ______
Comparison of Ki without broadcasting it in the air ______
Comparison of Ki without broadcasting it in the air ______
Authentication always performed by the VLR before call establishment and location ______
Authentication always performed by the VLR before call establishment and location ______
IMSI is a confidential identity of the ______
IMSI is a confidential identity of the ______
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Study Notes
Charging Process
- Charging depends on many factors
- The MSC (Mobile Switching Center) collects all information that could be the basis for charging
Charging Data Records (CDR)
- CDRs are stored in the MSC where they are generated
- CDRs must be kept at the first MSC that manages the call
Billing Center
- The Billing Center is responsible for producing bills for subscribers based on CDR information
- Collected CDRs are transferred in one bulk to the Billing Center
Authentication and Security
- Each subscriber has authentication keys, Ki, stored in the Authentication Center and SIM card
- Ki is compared without broadcasting it in the air for security
- Authentication is always performed by the VLR (Visitor Location Register) before call establishment and location update
Subscriber Identity
- IMSI (International Mobile Subscriber Identity) is a confidential identity of the subscriber
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