3GPP TS 04.99 – Direct subscriber access and restriction; Stage 3 3GPPTS04_series04.99 SPECIFICATION WITHDRAWN Related SpecTS 04.90 Unstructured Supplementary Service Data (USSD)TS 04.91 Explicit Call Transfer (ECT) Supplementary Service; Stage 3TS 04.93 Completion of Calls to Busy Subscriber (CCBS); Stage 3TS 04.96 Name Identification Supplementary Services; Stage 3