Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 349)

AT Commands Interface Guide for Open AT ® Firmware v6.63
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WM_DEV_OAT_UGD_049 - 001 VOLUME 3 August 23, 2007
[24] ETSI GSM 02.90 Digital cellular telecommunications system (Phase 2+) (GSM);Unstructured
Supplementary Service Data (USSD) - Stage 1
[25] ETSI GSM 02.85 Digital cellular telecommunications system (Phase 2+) (GSM);Closed User Group
(CUG) Supplementary Services - Stage 1