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1.SCOPE
2.DOCUMENT STATUS
2.1COPYRIGHT NOTICE
2.2ERRATA
2.3COMMENTS
3.REFERENCES
3.1NORMATIVE REFERENCES
4. DEFINITIONS AND ABBREVIATIONS
4.1DEFINITIONS
4.2ABBREVIATIONS
4.3REQUIREMENTS
5.GENERAL DESCRIPTION OF USSD
5.1INTRODUCTION
5.2THE USSD STANDARD
5.2.1 USSD phase
5.2.2 USSD phase
5.2.3 USSD phase+Enhanced USSD
5.3USSD CHARACTERISTICS AND PARAMETERS
5.3.1 General
5.3.2 The USSD Dialogue
5.3.3 Data Coding Scheme (DCS)
5.3.4 Service Code (SC)
5.3.5 USSD Timers
5.3.6 Multiple Dialogues
5.3.7 Addressing Aspects
5.3.8 Length of USSD String
6.WAP AND GSM USSD
6.1INTRODUCTION
6.2USSD DIALOGUE CONTROL PROTOCOL (UDCP)
6.3DATA CODING SCHEME (DCS)
6.4SERVICE CODE (SC)
6.5USSD OPERATION TIMERS
6.6MULTIPLE DIALOGUES
6.7ADDRESSING ASPECTS
6.8LENGTH OF THE USSD STRING
6.9THE USSD STRING
6.9.1 UDCP Information Element
6.9.2 Encoding of the USSD String
7.USSD DIALOGUE CONTROL PROTOCOL
7.1GOALS AND REQUIREMENTS
7.2ARCHITECTURAL OVERVIEW
7.3ADDRESSING
7.4UDCP SERVICE PRIMITIVES
7.4.1 Introduction
7.4.2 UDCP-Data
7.4.3 UDCP-Error
7.4.4 UDCP-Release
7.5DATA TRANSFER
7.5.1 Motivation
7.5.2 Procedure
7.6ERROR HANDLING
7.6.1 Motivation
7.6.2 Procedure
7.7USSD DIALOGUE RELEASE
7.7.1 Motivation
7.7.2 Procedure
7.8TIMERS AND COUNTERS
7.8.1 Idle Timer (IT)
7.8.2 Number Of RR (NumOfRR)
7.9PROTOCOL DATA UNITS
7.9.1 General
7.9.2 Data PDU
7.9.3 Data_Long PDU
7.9.4 Receive Ready (RR) PDU
7.9.5 Error PDU
7.9.6 Release Dialogue (RD) PDU
7.10HEADER FIELDS
7.10.1 More To Send flag (MTS)
7.10.2 Address Field
7.10.3 Version Flag
7.10.4 Error Code
7.10.5 Release Code
8.UDCP STATE TABLES
8.1EVENT PROCESSING
8.2ACTIONS
8.2.1 Timers
8.2.2 Counters
8.2.3 Messages
8.2.4 Output Buffer
8.2.5 USSD Dialogue
8.2.6 States
8.3MOBILE INITIATED USSD DIALOGUE
8.3.1 Mobile
8.3.2 Network
8.4NETWORK INITIATED USSD DIALOGUE
8.4.1 Mobile
8.4.2 Network
8.5EXAMPLE OF WDP AND UDCP
APPENDIX A.STATIC CONFORMANCE REQUIREMENT
A.1. FUNCTIONS