CONTENTS

�1���� Scope
�2���� References
�3���� Definitions
�4���� Abbreviations
�5���� Signalling interworking specification for ISDN User Part (ISUP)
������� 5.1���� Introduction
������� 5.2���� Methodology
������� 5.3���� Outgoing call
���������������� �5.3.1���� Sending of the Initial Address Message (IAM)
����������������� 5.3.2���� VPN call with VPN feature transparency
������� 5.4���� Incoming call
����������������� 5.4.1���� VPN call with VPN feature transparency
�6���� Signalling interworking specification for Transaction Capability User (TC-user)
������� 6.1���� Interworking at the Originating local exchange
����������������� 6.1.1���� Sending of the signalling connection establishment request
����������������� 6.1.2���� Receipt of the signalling connection establishment confirmation
����������������� 6.1.3���� Sending and receipt of private network specific information after confirmation of the signalling connection establishment
����������������� 6.1.4���� Release of the signalling connection
��� ����6.2���� Interworking at the Destination local exchange
����������������� 6.2.1���� Sending of the SETUP message
����������������� 6.2.2���� Sending of the signalling connection establishment confirmation
����������������� 6.2.3���� Sending and receipt of private network specific information after confirmation of the signalling connection establishment
����������������� 6.2.4���� Release of the signalling connection