NDR (Network Detection and Response)

In telecom networks, NDR is a security capability that analyzes network traffic in real time to detect malicious behavior, lateral movement, and data exfiltration, and to support response. A telecom-specific NDR understands signaling protocols (SS7, Diameter, GTP, SBA) and OAM traffic in addition to standard IP traffic.

Categories: Core NetworkSignalingProtocols and Standards

NDR in context

The mobile core carries subscriber sessions, mobility and policy. In 4G it is the EPC (MME, HSS, S/PGW); in 5G it is the Service-Based Architecture with AMF, SMF, UPF, AUSF, UDM and the NRF.

Signaling protocols carry the control-plane messages that set up calls, register subscribers 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 as top-tier telecom risk.

To place NDR in the wider telecom-security picture, review Conformance Testing, SM, ZIP, 5G SA, 5G SBA and ACL — each entry cross-references back to this page so you can walk the topic in either direction.

Related terms

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.