CONTENTS

�1���� Introduction
������� 1.1���� General
������� 1.2���� Objectives
������� 1.3���� General characteristics
�2���� Signalling system structure
������� 2.1���� Basic functional division
������� 2.2���� Functional levels
������� 2.3���� Signalling message
������� 2.4���� Functional interface
�3���� Message Transfer Part and the signalling network
������� 3.1���� General
������� 3.3���� Signalling network management functions
������� 3.4���� Testing and maintenance functions
������� 3.5���� Use of the signalling network
�4���� Message transfer capability
������� 4.1���� General
������� 4.2���� User location in system structure
������� 4.3���� Message content
������� 4.4���� User accessibility
������� 4.5���� Transport service performance
�5���� Differences from the Blue Book
������� 5.1���� Processor outage
������� 5.2���� Availability of adjacent signalling point
������� 5.3���� Handling of level 3 messages
������� 5.4���� Transferred controlled messages
������� 5.5���� Load balancing during changeback
������� 5.6���� Time-controlled changeover procedure
������� 5.7���� Changeback
������� 5.8���� MTP restart
������� 5.9���� Signalling traffic flow control
������ 5.10���� User part availability control
������ 5.11���� Signalling route management
�6�� ��Compatibility in the Message Transfer Part
������� 6.1���� Unreasonable information
������� 6.2���� Treatment of spare fields
������� 6.3���� Lack of acknowledgement
�7���� Interworking of yellow, red and blue MTP implementations
������� 7.1���� Yellow Book to Red Book interworking
������� 7.2���� Red Book to Blue Book interworking
������� 7.3���� Yellow Book to Blue Book interworking
������� 7.4���� Blue Book to the present version interworking
������� 7.5���� Red Book to the present version interworking
�8���� Primitives and parameters of the Message Transfer Part
������� 8.1���� Transfer
������� 8.2���� Pause
������� 8.3���� Resume
������� 8.4���� Status
������� 8.5���� Restart