SIST EN 300 485 V1.3.1:2005

• Abstract:

  This addendum specifies the ETSI DSS1 cause value.

• Status: Published
• Publication Date: 31-Dec-2004
• ICS: 33.080 - Integrated Services Digital Network (ISDN)
• Technical Committee: SPN - Services and Protocols for Networks
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-2005
• Due Date: 01-Jan-2005
• Completion Date: 01-Jan-2005
• Ref Project: ETSI EN 300 485 V1.3.1 (2001-04) - Integrated Services Digital Network (ISDN); Definition and usage of cause and location in Digital Subscriber Signalling System No. one (DSS1) and Signalling System No. 7 (SS7) ISDN User Part (ISUP) [ITU-T Recommendation Q.850 (1998) with addendum modified]

SIST EN 300 485 V1.3.1:2005 is the SIST adoption of an ETSI European Standard for Integrated Services Digital Network (ISDN) signalling. It defines the meaning and use of cause and location information in Digital Subscriber Signalling System No. one (DSS1) and Signalling System No. 7 (SS7) ISDN User Part (ISUP), based on ITU-T Recommendation Q.850 (1998) with an ETSI addendum. In practice, it is the reference for people implementing, configuring, or testing ISDN call-clearing and call-rejection signalling.

What does SIST EN 300 485 V1.3.1:2005 specify?

SIST EN 300 485 V1.3.1:2005 specifies the ETSI DSS1 cause value and the related coding used in DSS1 and ISUP signalling. It is a modification of ITU-T Recommendation Q.850 (1998) and its addendum, with ETSI-specific changes applied throughout the text.

The document is organized around:

• a references clause,
• a modified Table 1 in Q.850,
• a new subclause for Cause No. 24,
• and a new clause on ETSI DSS1 cause values.

These parts matter because they tell implementers which companion documents to use, which new cause value to signal, and how to code that value consistently.

What are the key requirements of SIST EN 300 485 V1.3.1:2005?

SIST EN 300 485 V1.3.1:2005 mainly updates the Q.850 cause-value framework for ETSI use. The key points are the added cause value, the definition of that cause, and the coding rules for DSS1 cause values.

Reference handling

The references clause distinguishes between specific and non-specific references. Specific references are fixed to the cited edition, while non-specific references use the latest version. In practice, this tells engineers whether a later revision is automatically part of the standard.

Updated companion references

Throughout Q.850 and its addendum, references to ITU-T Recommendation Q.730, ITU-T Recommendation Q.763, and ITU-T Recommendation Q.931 are replaced by the modified ETSI documents EN 300 356-2, EN 300 356-1, and EN 300 403-1 respectively. This matters because the signalling behavior is tied to the ETSI versions, not the original ITU-T texts.

New cause value in Table 1

Table 1 is updated with Cause No. 24, named “Call rejected due to ACR supplementary service.” For implementers, this means the signalling system must be able to represent that specific rejection reason.

Definition of Cause No. 24

Subclause 2.2.7.1.17bis explains that Cause No. 24 indicates a call rejected because the destination applies the anonymous call reject supplementary service (ACR). In practice, this is the cause to use when the network or service rejects a call for anonymity-related policy reasons.

ETSI DSS1 cause value coding

The new ETSI DSS1 cause values clause states that octets 3 and 5 are coded in the same way as standardized ITU-T cause values. It also requires the coding standard in octet 3, bits 7 and 6, to be coded as “10” for national standard. That tells protocol designers how to encode the cause correctly on the wire.

National cause-value allocation

The clause recommends using the same classification for national cause values in octet 4 as is used for ITU-T coding. This helps keep national and standardized cause values aligned, which reduces interoperability problems between equipment from different vendors.

What terms does SIST EN 300 485 V1.3.1:2005 define?

• Anonymous call reject (ACR) - A supplementary service at the destination that can reject a call when anonymous calling is not accepted.
• Cause value - The coded reason carried in signalling to explain why a call was rejected or cleared.
• Location - The signalling field that identifies where the cause was generated in the network path.
• DSS1 - Digital Subscriber Signalling System No. one, used for ISDN user signalling.
• ISUP - ISDN User Part, the part of SS7 used for circuit-switched call signalling.
• SS7 - Signalling System No. 7, the signalling network used to carry call-control information.
• Coding standard - The bit setting that identifies whether a cause value is national or ETSI-standard.

Who uses SIST EN 300 485 V1.3.1:2005?

SIST EN 300 485 V1.3.1:2005 is used by ISDN equipment manufacturers, signalling protocol implementers, network operators, and test laboratories. It is relevant wherever DSS1 or SS7/ISUP call control must report a rejection reason in a standardized way. Buyers and quality teams use it to check whether equipment supports the ETSI cause coding needed for interoperability.

What changed in SIST EN 300 485 V1.3.1:2005 from the previous edition?

The document history lists an earlier edition from January 1996, a V1.2.3 publication from October 1999, and this V1.3.1 publication in April 2001. The text shown here adds Cause No. 24, the definition for that cause, the references clause, and the ETSI DSS1 cause values clause.

Which standards are used with SIST EN 300 485 V1.3.1:2005?

• ITU-T Recommendation Q.850 (1998) - The base recommendation for cause and location in DSS1 and ISUP.
• EN 300 356-1 - Provides the ETSI-modified ISUP basic services reference used in place of ITU-T Recommendation Q.763.
• EN 300 356-2 - Provides the ETSI-modified ISUP supplementary services reference used in place of ITU-T Recommendation Q.730.
• EN 300 403-1 (V1.3.2) - Provides the ETSI-modified DSS1 basic call control protocol used in place of ITU-T Recommendation Q.931.

What does the SIST EN 300 485 V1.3.1:2005 document contain?

The document contains a references clause, the ETSI endorsement notice, and targeted modifications to ITU-T Recommendation Q.850 and its addendum. It updates Table 1 with a new cause value, adds a subclause defining Cause No. 24, and adds a clause describing ETSI DSS1 cause value coding. It also includes reference substitutions that point implementers to the ETSI-modified ISUP and DSS1 companion standards.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.VSUHPHQMHQR@Integrated Services Digital Network (ISDN); Definition and usage of cause and location in Digital Subscriber Signalling System No. one (DSS1) and Signalling System No. 7 (SS7) ISDN User Part (ISUP) [ITU-T Recommendation Q.850 (1998) with addendum modified]33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:EN 300 485 Version 1.3.1SIST EN 300 485 V1.3.1:2005en01-januar-2005SIST EN 300 485 V1.3.1:2005SLOVENSKI
STANDARD
ETSIEN300485V1.3.1(2001-04)EuropeanStandard(Telecommunicationsseries)IntegratedServicesDigitalNetwork(ISDN);DefinitionandusageofcauseandlocationinDigitalSubscriberSignallingSystemNo.one(DSS1)andSignallingSystemNo.7(SS7)ISDNUserPart(ISUP)[ITU-TRecommendationQ.850(1998)withaddendummodified]SIST EN 300 485 V1.3.1:2005

ETSIETSIEN300485V1.3.1(2001-04)2ReferenceREN/SPAN-01096KeywordsISDN,DSS1,ISUP,SS7ETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:[phone]Fax:[phone]SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88ImportantnoticeIndividualcopiesofthepresentdocumentcanbedownloadedfrom:http://www.etsi.orgThepresentdocumentmaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.Usersofthepresentdocumentshouldbeawarethatthedocumentmaybesubjecttorevisionorchangeofstatus.InformationonthecurrentstatusofthisandotherETSIdocumentsisavailableathttp://www.etsi.org/tb/status/Ifyoufinderrorsinthepresentdocument,sendyourcommentto:[e-mail]opartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2001.Allrightsreserved.SIST EN 300 485 V1.3.1:2005

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