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