Lawful Interception (LI) framework

Design Philosophy
Separation of concerns: Each function has its own clear responsibility.
Security & auditability: All interception is supposed to be authorized, logged, and under control.
Scalability: Multiple targets can be intercepted via configurable delivery channels.
Standards-based: Use of protocols like LAESP ensures interoperability.

High-Level Architectural Concepts

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• At a high level, this system is logically divided into four major
  components:
• DF (Delivery Function) — Transfers intercepted data.
• CF (Collection Function) — Receives and analyzes intercepted data.
• SPAF (Service Provider Administration Function) — Managed by telecom
  operator or service provider to control and configure interception.
• LEAF (Law Enforcement Administration Function) — Managed by law
  enforcement to request and manage interception.

https://en.wikipedia.org/wiki/Lawful_interception