PD 6645:2002

0 PREFACE
   0.1 Title
   0.2 Normative Information
   0.3 Contents
   0.4 History
   0.5 Issue Control
   0.6 References
   0.7 Glossary of Terms
1 INTRODUCTION
   1.0 Scope
   1.1 Scope of PNO-ISC/SPEC/006
   1.2 Contents of PNO-ISC/SPEC/006
2 MESSAGE TYPES AND CONTENTS
   2.0 Scope
   2.1 General
   2.2 Message Groups and Types
   2.3 Message Contents
   2.4 Parameter Formats and Code Allocations
   2.A ANNEX 2.A - Service Indicator Code (SIC)
        Allocations
   2.B ANNEX 2.B - Validity of Release Reasons when
        RPI=0
3 COMMON PROCEDURES
   3.0 Scope
   3.1 General
   3.2 Common Call Control Procedures
   3.3 Call Control Error Handling Procedures
   3.4 Circuit Blocking/Unblocking Procedures
   3.5 MTP INTERACTIONS
   3.6 Timer Table
4 TELEPHONY CALL
   4.0 Scope
   4.1 Service Overview
   4.2 Formats and Codes
   4.3 Signalling Procedures
   4.4 Message Sequence Diagram
5 SPARE
6 ISDN CALL
   6.0 Scope
   6.1 Service Overview
   6.2 Formats and codes
   6.3 Signalling Procedures
   6.4 Message Sequence Diagram
7 SPARE
8 SPARE
9 CALLING LINE IDENTIFICATION PRESENTATION AND
   RESTRICTION (CLIP AND CLIR)
   9.0 Scope
   9.1 Service Overview
   9.2 Information Flows
   9.3 Formats and Codes
   9.4 Signalling Procedures
   9.5 Variances
10 NUMBER PORTABILITY
   10.0 Scope
   10.1 Formats and Codes
   10.2 Signalling Procedures
   10.3 Message Sequence Diagram
11 COMPLETION OF CALLS TO BUSY SUBSCRIBER (CCBS)
   11.0 Scope
   11.1 Service Overview
   11.2 Formats and Codes
   11.3 Signalling Procedures
   11.4 Message Sequence Diagrams
12 TARGETED TRANSIT
   12.0 Scope
   12.1 Formats and Codes
   12.2 Signalling Procedures
13 SPARE
14 SPARE
15 SPARE
16 OPERATOR SERVICES
   16.0 Scope
   16.1 Service Overview
   16.2 Message Types and Contents
   16.3 Signalling Procedures - Basic Service
   16.4 Signalling Procedures - Override Service
   16.5 Signalling Procedures - Interception Service

Gives a "library" of messages and parameters that are standardised for use across a national interconnect between two Public Network Operators.