GUAMI (Globally Unique AMF Identifier)
Also known as: Globally Unique AMF Identifier
A GUAMI is the 5G identifier that uniquely names a specific AMF instance in a specific PLMN, composed of PLMN ID, AMF Region ID, AMF Set ID and AMF Pointer. GUAMIs are used inside 5G-GUTIs and in inter-AMF handover signalling so that any node can route a UE context to the correct AMF.
Categories: Core Network
GUAMI in context
The mobile core is where subscriber sessions, mobility and policy live. 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. Core exposure is the difference between a single-subscriber leak and a fleet-wide breach.
To place GUAMI in the wider telecom-security picture, review TEID, OAuth2 in 5G Core, Network Slice, N2 Handover, GTP and Jamming.
Related terms
Equipment
Mobility management (MME, AMF, SGSN)
Related topic hubs
- 5G Security 5G SBA, SEPP, SUCI, 5G-AKA, N32 and service-based interface security.
- NAS Security Non-Access Stratum security, integrity and ciphering algorithms.
- 5G NEF Security Network Exposure Function security in the 5G core.
- 5G Penetration Testing Pentesting the 5G core, SBA, SEPP, and gNB interfaces.
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.