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user part (ISDN) (UP)

The User Part (UP) is a service feature ofISDN. It determines which features and additional services can be used for international connections. The user part is part of the SS7 signaling before central signaling.

Structure of the Message Signal Unit

Structure of the Message Signal Unit

The User Part data field is divided into the Signalling Information Field( SIF), the data field for Signalling Link Selection( SLS), and the data fields for the originating point code( OPC) and the destination point code ( DPC).

There are three versions of the user part for international connections: the Telephone User Part( TUP), the Enhanced Telephony User Part (TUP+) and the ISDN User Part( ISUP).

Englisch: user part (ISDN) - UP
Updated at: 15.06.2015
#Words: 104
Links: service, user, signalling system no 7 (SS7), data, field
Translations: DE

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