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TS 04.90 (CT4)
Unstructured Supplementary Service Data (USSD)

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(P) GSM Rel-98 v7.0.1    2000/01    14 p.
(P) GSM Rel-97 v6.0.1    1998/11    14 p.
(P) GSM Rel-96 v5.0.1    1996/11    16 p.
(W-zip) GSM Phase-2 v4.1.1    1994/11    16 p.

Rapporteur:  HODGES, Phil
Descendant(s):  TS 24.090    
See also:  USSD-related TS/TR    

This TS 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 USSD operations
  • Mobile initiated USSD operations


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