This technical specification gives the stage 3 description of the unstructured supplementary service data (USSD) operations. The group of unstructured supplementary service data operations is divided into two different classes: - Network initiated unstructured supplementary service data operations (section 5); - Mobile initiated unstructured supplementary service data operations (section 6).
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prSSH ETS 300 572:1995 ed.1
40.60
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May 11, 2026