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ISDN user part (ISUP)

The ISDNUser Part (ISUP) is one of several possible user parts (UP) of the SS7 signalling. The ISDN User Part is the ISDN-specific part of the transmission of additional information via the signalling channel between exchanges

. Functionally, it is comparable to the 1TR6 protocol or the DSS1 protocol, Digital Subscriber System

no. 1 (DSS1), on the subscriber side. ISUP is the prerequisite for a complete ISDN service offering in national and international traffic. Theavailability of all supplementary services depends on the national implementations

. The ISDN User Parts is entered in the data field for the service indicator, the Service Indicator (SI). The SI data field is a 4-bit long data field in the Message Transfer Part (MTP) of the Message Signal Unit (MSU).

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Englisch: ISDN user part - ISUP
Updated at: 21.06.2011
#Words: 110
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Translations: DE