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3GPP 52-series — OAMP and Charging
TS 52.008
REL 6 → 16
GSM Subscriber and Equipment Trace
TS 52.021
REL 4 → 16
Network Management Procedures and Messages
on the A-bis Interface
TS 52.402
REL 4 → 16
Performance Management —
Performance Measurements –
GSM
