TR TSY 000847 : ISSUE 1 REV 1

1 INTRODUCTION
1.1 Purpose
1.2 Scope
2 ISDN FEATURES: EVOLUTION FROM TELEPHONY
2.1 Feature evolution
2.1.1 Conventional features: PSTN and ISDN
2.1.1.1 Dial access to features
2.1.1.2 Feature specific alerting
2.1.1.3 Multiple call handling
2.1.1.4 Features with special signalling arrangements
2.1.2 Improvements to conventional features
2.1.2.1 Support of feature keys and status indicators
2.1.2.2 Improved control
2.1.2.3 Improved feedback
2.1.2.4 Feature-specific information element values
2.1.3 New ISDN features
2.2 ISDN feature assignments
2.2.1 Examples and guidelines for feature assignment
2.2.1.1 ISDN access interfaces
2.2.1.2 Directory number/call type
2.2.1.3 Terminal service profiles
2.2.1.4 Directory number/call type/terminal service profile
2.2.1.5 Customer group
2.2.2 Feature assignment interactions
2.2.3 Example configurations requiring terminal initialization
3 PROTOCOL SUPPORT FOR ISDN FEATURES
3.1 Dial access for feature invocation
3.1.1 Introduction
3.1.1.1 Background
3.1.1.2 Conditions under which an access code can be accepted
        by the switch
3.1.2 Dial access procedures
3.1.2.1 Supporting activities
3.2 Information request for feature invocation
3.2.1 Introduction
3.2.2 Background
3.2.3 Information request procedures
3.2.4 Supporting activities
3.3 Provision of tones and alerting indications to the
        end user
3.3.1 Background
3.3.2 Indications within features
3.3.2.1 When the end user subscribes to network-provided
        tones and announcements
3.3.2.2 When the end user does not subscribe to network-
        provided tones and announcements
3.3.2.3 Special considerations for multiple-call handling
        features
3.4 Context-dependent control of features
3.4.1 Single call reference
3.4.2 Contextual feature operator
3.4.3 Specific feature control
3.5 feature-key management protocol and procedures
3.5.1 Introduction
3.5.2 Feature activation and feature indication information
        elements
3.5.2.1 Feature activator
3.5.2.2 Feature indicator
3.5.2.3 Assignment
3.5.3 Procedures
3.5.3.1 Assumptions and restrictions
3.5.3.2 Feature invocation
3.5.3.3 General aspects
3.5.3.4 Error conditions
3.6 Terminal identification protocol and procedures
3.6.1 Introduction
3.6.2 Definitions
3.6.3 Identifying terminals in various configurations
3.6.4 Terminal service profile association with terminals
3.6.5 Call-associated feature requests
3.6.5.1 Call originations
3.6.5.2 Call offering
3.6.5.3 Other
3.6.6 Non-call associated
3.6.7 Initialization
3.6.7.1 Protocol elements
3.6.7.2 Procedures
3.6.7.3 Timers
3.6.7.4 Re-initialization
3.6.7.5 Clearing of initialization
3.6.8 Local addressing for call offering in shared DN
        scenarios
3.6.9 Assignment and administration of identifiers
3.7 Feature-specific control messages
3.7.1 Introduction
3.7.2 HOLD and RETrieve messages
3.7.3 Electronic key telephone service messages
3.7.3.1 Originating treatment
3.7.3.2 Terminating treatment
3.7.3.3 Release treatment
3.8 Call-reference-busy limit
4 SUMMARY
5 FIGURES
6 LINE DIAGRAMS
7 GLOSSARY
8 REFERENCES