Plain-language definition
The 5G core function that manages subscriber data.
Technical definition
UDM exposes Nudm services over HTTP/2 to AMF, SMF and AUSF for authentication, registration and subscription data, typically backed by a UDR.
Why it matters
UDM support brings 5G subscribers into the same platform as HLR and HSS records.
Last reviewed 2026-09-12 by the Guardivia QoS Engineering Team. Product facts on this page describe current capabilities; items marked “where supported”, “optional”, “integration” or “consultancy” are confirmed per deployment.