Charging System

Charging System in context

Signaling protocols carry the control-plane instructions that set up calls, register subscribers, hand over sessions and route SMS. SS7, Diameter, GTP-C and SIP are the four dominant families, and interconnect exposure of any of them is treated by GSMA FS.11 / FS.19 / FS.20 as a top-tier telecom risk.

Telecom security is written into standards from 3GPP, GSMA, ETSI, IETF and ITU-T. Understanding which body owns which specification, and how the specs interlock (for example 3GPP TS 33.501 with GSMA FS.34 for 5G SBA security), is essential for both design and audit work.

To place Charging System in the wider telecom-security picture, review OCS, Rx Interface, Rf / Ro, 3GPP, Control Plane Security and NDR.

Related terms

• OCS
• Rx Interface
• Rf / Ro
• 3GPP
• Control Plane Security
• NDR
• PCRF
• Attack Surface Mapping

Equipment

Policy and charging (PCRF, PCF, CHF, OCS, OFCS)

• CHF
• OCS
• OFCS
• PCF
• PCRF

Articles in the P1 mobile network security guide

Related topic hubs

• Diameter Attacks S6a IDR/PUR/CLR abuse, subscriber tracking, LTE signaling attacks.
• Signaling Firewall Unified SS7/Diameter/GTP/SMS signaling firewall framework.
• Diameter Security 4G/LTE Diameter threats across IPX/roaming and DEA defenses.
• Diameter Firewall GSMA FS.19 screening at the Diameter Edge Agent on S6a/S9/S13.

More from the TelcoSec Glossary

Browse the full TelcoSec Glossary, the Ultimate Guide to Mobile Network Security, or the P1 Arsenal of telecom-security tools.