> For the complete documentation index, see [llms.txt](https://gsm.learn-telecom.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gsm.learn-telecom.com/architecture/abc-administration-and-billing-center.md).

# ABC - Administration & Billing Center

ABC is responsible to provisioning SIM cards and insert the customer data inside HLR and equipment data inside AuC.

Manage CDR - Call Records