Integrated Services Digital Network (ISDN); Digital Subscriber Signalling System No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control; Part 1: Protocol specification [ITU-T Recommendation Q.931 (1993), modified]

to provide an update based on SPS5 meeting (Galway 05/96) TDs 107, 151, 153, and 234, and to include the agreed Q.931 changes documented in the output of ITU-T SG11 meeting (Miyazaki 02/96)

Digitalno omrežje z integriranimi storitvami (ISDN) - Protokol digitalne naročniške signalizacije št. 1 (DSS1) - Signalizacijska omrežna plast za krmiljenje vodovnega osnovnega klica - 1. del: Specifikacija protokola (priporočilo ITU-T Q.931 (1993), spremenjeno)

General Information

Status
Published
Publication Date
30-Jun-2005
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Jul-2005
Due Date
01-Jul-2005
Completion Date
01-Jul-2005

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.VSUHPHQMHQRIntegrated Services Digital Network (ISDN); Digital Subscriber Signalling System No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control; Part 1: Protocol specification [ITU-T Recommendation Q.931 (1993), modified]35.100.30Omrežni slojNetwork layer33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:EN 300 403-1 Version 1.2.2SIST EN 300 403-1 V1.2.2:2005en01-julij-2005SIST EN 300 403-1 V1.2.2:2005SLOVENSKI

STANDARD
SIST EN 300 403-1 V1.2.2:2005

European Telecommunications Standards Institute EN 300 403-1 V1.2.2 (1998-04)European Standard (Telecommunications series)Integrated Services Digital Network (ISDN);Digital Subscriber Signalling System No. one (DSS1) protocol;Signalling network layer for circuit-mode basic call control;Part 1: Protocol specification[ITU-T Recommendation Q.931 (1993), modified]SIST EN 300 403-1 V1.2.2:2005

EN 300 403-1 V1.2.2 (1998-04)2ReferenceREN/SPS-05124-1 (3qc90ipc.PDF)KeywordsISDN, DSS1, layer 3, basic, UNIETSI SecretariatPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: +33 4 92 94 42 00

Fax: +33 4 93 65 47 16Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/88Internetsecretariat@etsi.frhttp://www.etsi.frhttp://www.etsi.orgCopyright NotificationNo part may be reproduced except as authorized by written permission.The copyright and the foregoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1998.All rights reserved.SIST EN 300 403-1 V1.2.2:2005

EN 300 403-1 V1.2.2 (1998-04)3Intellectual Property RightsIPRs essential or potentially essential to the present document may have been declared to ETSI. The informationpertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be foundin ETR 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect ofETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on the ETSIWeb server (http://www.etsi.fr/ipr or http://www.etsi.org/ipr).Pursuant to the ETSI Interim IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. Noguarantee can be given as to the existence of other IPRs not referenced in ETR 314 (or the updates on the ETSI Webserver) which are, or may be, or may become, essential to the present document.ForewordThis European Standard (Telecommunications series) has been produced by ETSI Technical Committee SignallingProtocols and Switching (SPS).The present document is part 1 of a multi-part standard covering the Digital Subscriber Signalling System No. one(DSS1) protocol specification for the Integrated Services Digital Network (ISDN) signalling network layer for circuit-mode basic call control, as described below:Part 1:"Protocol specification";Part 2:"Specification and Description Language (SDL) diagrams";Part 3:"Protocol Implementation Conformance Statement (PICS) proforma specification";Part 4:"Test Suite Structure and Test Purposes (TSS&TP) specification for the user";Part 5:"Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT)proforma specification for the user";Part 6:"TSS&TP specification for the network";Part 7:"ATS and partial PIXIT proforma specification for the network".The present document which is based upon ITU-T Recommendation Q.931 (1993) is an extended and updated versionof ETS 300 403-1 (1995) and ETS 300 102-1 (1990). Annex ZA identifies relevant differences between the presentdocument and these standards.National transposition datesDate of adoption of this EN:3 April 1998Date of latest announcement of this EN (doa):31 July 1998Date of latest publication of new National Standardor endorsement of this EN (dop/e):31 January 1999Date of withdrawal of any conflicting National Standard (dow):31 January 1999SIST EN 300 403-1 V1.2.2:2005

EN 300 403-1 V1.2.2 (1998-04)4Endorsement noticeThe text of ITU-T Recommendation Q.931 (1993) was approved by ETSI as an EN with agreed modifications as givenbelow.NOTE:New or modified text is indicated using sidebars. In addition, underlining and/or strike-out are used tohighlight detailed modifications where necessary.Page 1, clause 1Delete clause 1 (General) and subclause 1.1 (Scope of the Recommendation).Insert the following three clauses (Scope, References, Definitions) at the start of the text:ScopeThis first part of EN 300 403-1 specifies the stage three of circuit-mode on-demand basic telecommunication servicesfor the pan-European Integrated Services Digital Network (ISDN) as provided by European telecommunicationsoperators at the T reference point or coincident S and T reference point (as defined in ITU-T RecommendationI.411 [95] by means of the Digital Subscriber Signalling System No. one (DSS1). Stage three identifies the protocolprocedures and switching functions needed to support a telecommunication service (see CCITT RecommendationI.130 [92]).In addition, the present document specifies the protocol requirements at the T reference point where the service isprovided to the user via a private ISDN.NOTE 1:Procedures at the T reference point, to support the access of a private ISDN to the public ISDN are notexplicitly identified in the present document, however some procedures are applicable only to the Treference point.The present document does not specify the additional protocol requirements where the service is provided to the user viaa telecommunication network that is not an ISDN.A basic telecommunication service is a fundamental type of service. It forms the basis on which supplementary servicesmay be added.NOTE 2:Specific requirements of individual circuit-mode basic telecommunication services are not covered in thepresent document. However, ETR 018/EG 201 018 gives guidance on the use of service specificinformation elements to implement individual basic telecommunication services.Further parts of the present document specify the Specification and Description Language (SDL) diagrams, the methodof testing, and detailed application specific requirements to determine conformance based on the present document.The present document is applicable to equipment supporting circuit-mode on-demand basic telecommunication services,to be attached at either side of a T reference point or coincident S and T reference point when used as an access to thepublic ISDN.ReferencesReferences may be made to:a)specific versions of publications (identified by date of publication, edition number, version number, etc.), inwhich case, subsequent revisions to the referenced document do not apply; orb)all versions up to and including the identified version (identified by "up to and including" before the versionidentity); orc)all versions subsequent to and including the identified version (identified by "onwards" following the versionidentity); orSIST EN 300 403-1 V1.2.2:2005

EN 300 403-1 V1.2.2 (1998-04)5d)publications without mention of a specific version, in which case the latest version applies.A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the samenumber.[87]CCITT Recommendation F.710 (1991): "General principles for audiographic conference service".[88]ITU-T Recommendation F.711 (1993): "Audiographic conference teleservice for ISDN".[89]CCITT Recommendation F.720 (1992): "Videotelephony services - General".[90]CCITT Recommendation F.730 (1992): "Videoconference service - General".[91]ITU-T Recommendation I.112 (1993): "Vocabulary of terms for ISDNs".[92]CCITT Recommendation I.130 (1988): "Method for characterization of telecommunicationservices supported by an ISDN and network capabilities of an ISDN".[93]ITU-Recommendation I.140 (1993): "Attribute technique for the characterization oftelecommunication services supported by an ISDN and network capabilities of an ISDN".[94]ITU-T Recommendation I.210 (1993): "Principles of telecommunication services supported by anISDN and the means used to describe them".[95]ITU-T Recommendation I.411 (1993): "ISDN user network interfaces - reference configurations".[96]CCITT Recommendation Q.9 (1988): "Vocabulary of switching and signalling terms".[97]ITU-T Recommendation V.34 (1994): "A modem operating at data signalling rates of up to28 800 bit/s for use on the general switched telephone network and on leased point-to-point 2-wiretelephone-type circuits".[98]ETS 300 007 (1991): "Integrated Services Digital Network (ISDN); Support of packet-modeterminal equipment by an ISDN".[99]ETS 300 011 (1990): "Integrated Services Digital Network (ISDN); Primary rate user-networkinterface layer 1 specification and test principles".[100]ETS 300 012 (1990): "Integrated Services Digital Network (ISDN); Basic user-network interfacelayer 1 specification and test principles".[101]ETS 300 058-1: "Integrated Services Digital Network (ISDN); Call Waiting (CW) supplementaryservice; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocolspecification".[102]ETS 300 092-1: "Integrated Services Digital Network (ISDN); Calling Line IdentificationPresentation (CLIP) supplementary service; Digital Subscriber Signalling System No. one (DSS1)protocol; Part 1: Protocol specification".[103]ETS 300 093-1: "Integrated Services Digital Network (ISDN); Calling Line IdentificationRestriction (CLIR) supplementary service; Digital Subscriber Signalling System No. one (DSS1)protocol; Part 1: Protocol specification".[104]ETS 300 122-1: "Integrated Services Digital Network (ISDN); Generic keypad protocol for thesupport of supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol;Part 1: Protocol specification".[105]EN 300 196-1 (V1.2): "Integrated Services Digital Network (ISDN); Generic functional protocolfor the support of supplementary services; Digital Subscriber Signalling System No. one (DSS1)protocol; Part 1: Protocol specification".[106]ETS 300 207-1: "Integrated Services Digital Network (ISDN); Diversion supplementary services;Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification".SIST EN 300 403-1 V1.2.2:2005

EN 300 403-1 V1.2.2 (1998-04)6[107]ETS 300 286-1: "Integrated Services Digital Network (ISDN); User-to-User Signalling (UUS)supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1:Protocol specification".[108]ETS 300 383 (1995): "Integrated Services Digital Network (ISDN); File transfer over the ISDN;EUROFILE transfer profile".[109]ETS 300 388 (1995): "Integrated Services Digital Network (ISDN); File Transfer Access &Management (FTAM) over ISDN based on simple file transfer profile".[110]ETS 300 402-1 (1995): "Integrated Services Digital Network (ISDN); Digital SubscriberSignalling System No. one (DSS1) protocol; Data link layer; Part 1: General aspects [ITU-TRecommendation Q.920 (1993), modified]".[111]ETS 300 402-2 (1995): "Integrated Services Digital Network (ISDN); Digital SubscriberSignalling System No. one (DSS1) protocol; Data link layer; Part 2: General protocol specification[ITU-T Recommendation Q.921 (1993), modified]".[112]ETS 300 403-2 (1995): "Integrated Services Digital Network (ISDN); Digital SubscriberSignalling System No. one (DSS1) protocol; Signalling network layer for circuit-mode basic callcontrol; Part 2: Specification and Description Language (SDL) diagrams".[113]ETS 300 485 (1995): "Integrated Services Digital Network (ISDN); Definition and usage of causeand location in Digital Subscriber Signalling System No. one (DSS1) and Signalling System No. 7ISDN User Part (ISUP)".NOTE:The references listed in the present document are a continuation of publications referenced in ITU-TRecommendation Q.931.DefinitionsFor the purposes of the present document, the following definitions apply, together with those given in the referencedpublications:access channel; channel: See CCITT Recommendation Q.9 [96], definition 0008.B-channel: A 64 kbit/s channel accompanied by timing intended to carry a wide variety of user information streams. AB-channel does not carry signalling information for circuit switching by the ISDN.basic access: See CCITT Recommendation Q.9 [96], definition 1551.basic service; basic telecommunication service: See CCITT Recommendation Q.9 [96], definition 7018.call: See CCITT Recommendation Q.9 [96], definition 2201.call control message: A message as defined in subclause 3.1 of the present document, which on sending or receiptcauses a change of the call state at either the network or the user; and also PROGRESS and INFORMATION messages.call establishment; connection establishment: See CCITT Recommendation Q.9 [96], definition 2207.call reference: An identifier of a signalling transaction. The signalling transaction may either be bearer related, in whichcase the signalling transaction can be used to control that bearer, or bearer independent, in which case there is no bearerassociated with that signalling transaction. All signalling transactions in the present document are bearer related exceptthose associated with the global call reference. Where there is only one bearer required for a call, then the call referenceof the associated bearer related signalling transaction may be used to identify the call. In the present document, there isonly one bearer for each call.call state: A state as defined in subclause 2.1 of the present document, for either the user side or network side asappropriate. A call state may exist for each call reference value (and at the network side for each additional respondingCEI in the incoming call states).circuit switched; circuit switching: See CCITT Recommendation Q.9 [96], definition 1125.SIST EN 300 403-1 V1.2.2:2005

EN 300 403-1 V1.2.2 (1998-04)7comprehension required: The requirement that the coding structure and meaning of an information element shall beunderstood by its receiver for the message to be processed. A specific range of values for information element identifiersis provided for those information elements for which comprehension is required.connection: See CCITT Recommendation Q.9 [96], definition 0011. In the present document, the term is taken toinclude a bearer and its associated control signalling.D-channel: A channel primarily intended to carry signalling information for circuit switching by the ISDN.data link connection endpoint identifier: Identifier used by a layer 3 protocol entity to address its peer entity.dummy call reference: A call reference value of one octet length encoded as "0000 0000".en bloc receiving: A procedure, used in call establishment of an incoming call, to enable the network to send calledparty number digits to the user in a single message.en bloc sending: A procedure, used in call establishment of an outgoing call, to enable the user to send called partynumber digits to the network in a single message.global call reference: A Call reference information element with a call reference value of zero. The length of the callreference value is encoded in the first octet of the information element. The Global call reference identifies all callreferences currently associated with the appropriate data link connection endpoint identifier.Incoming (call): A call incoming to the user side of the interface.Integrated Services Digital Network (ISDN): See ITU-T Recommendation I.112 [91], definition 308.interface: See CCITT Recommendation Q.9 [96], definition 4001.Network Service Access Point (NSAP) address; OSI NSAP address: See CCITT Recommendation Q.9 [96],definition 2083.network: The DSS1 protocol entity at the network side of the user-network interface.on demand: See ITU-T Recommendation I.140 [93], annex A, clause A.2.Open System Interconnection (OSI): The concept of interconnecting systems in accordance with the architecturedescribed in the Open System Interconnection Reference model (CCITT Recommendation X.200 [78]).outgoing (call): A call outgoing from the user side of the interface.overlap receiving: A procedure, used in call establishment of an incoming call, to enable the network to send calledparty number digits to the user in successive messages, as and when they are made available from the remote network.overlap sending: A procedure, used in call establishment of an outgoing call, to enable the user to send called partynumber digits to the network in successive messages, as and when they are made available by the user.point-to-multipoint configuration; multipoint terminal configuration; multipoint configuration: A terminalconfiguration in which there is more than one signalling entity.point-to-multipoint data link; broadcast data link: A data link connection with the capability of supporting more thantwo connection endpoints.point-to-point configuration; single-point terminal configuration; single-point configuration: A terminalconfiguration in which there is one signalling entity.point-to-point data link: A data link on which a frame is directed to a single endpoint.primary rate access: See CCITT Recommendation Q.9 [96], definition 1552.service; telecommunication service: See ITU-T Recommendation I.112 [91], definition 201.supplementary service: See ITU-T Recommendation I.210 [94], subclause 2.4.user: The DSS1 protocol entity at the user side of the user-network interface.SIST EN 300 403-1 V1.2.2:2005

EN 300 403-1 V1.2.2 (1998-04)8Throughout the text of ITU-T Recommendation Q.931Replace references throughout the text as shown below.Reference in ITU-T Recommendation Q.931Modified referenceITU-T Recommendation I.430 [46]ETS 300 012 [100]ITU-T Recommendation I.431 [27]ETS 300 011 [99]ITU-T Recommendation Q.850 [67]ETS 300 485 [113]ITU-T Recommendation Q.920 [45]ITU-T Recommendation Q.920 as modified by ETS 300 402-1 [110]ITU-T Recommendation Q.921 [3]ITU-T Recommendation Q.921 as modified by ETS 300 402-2 [111]ITU-T Recommendation Q.931ITU-T Recommendation Q.931 as modified by the present documentITU-T Recommendation Q.951 [85], section 3ETS 300 092-1 [102]ITU-T Recommendation Q.951 [85], section 4ETS 300 093-1 [103]ITU-T Recommendation Q.952 [86]ETS 300 207-1 [106]ITU-T Recommendation Q.953 [84], section 1ETS 300 058-1 [101]ITU-T Recommendation Q.957 [54], section 1ETS 300 286-1 [107]Pages 1 and 2, clause 2Replace the second paragraph by:In the subclauses which follow, states are defined for circuit switched calls in subclause 2.1 (call states) and for theinterface in subclause 2.4 (global call reference states).Replace the three last paragraphs by:A detailed description of the procedures for call control is given in clause 5 in terms of:a)the messages defined in clause 3 which are transferred across the user-network interface;b)the information processing and actions that take place at the user side and the network side. Detailed SDLdiagrams for call control of circuit switched calls are contained in ETS 300 403-2 [112].Page 2, subclause 2.1, last paragraphDelete the last paragraph referring to annex D.Pages 4 to 6, subclause 2.2Delete subclause 2.2 and all of its subclauses. The basic packet-mode access connection control states for access to theISDN virtual bearer service are defined in ETS 300 007 [98] and are outside the scope of the present document.Pages 6 to 8, subclause 2.3Delete subclause 2.3 and all of its subclauses. Temporary signalling connections are outside the scope of the presentdocument.Page 8, subclause 2.4, last paragraphReplace the last paragraph by:The global call reference shall be handled independently for incoming and outgoing sides, i.e. two independent statemachines in an entity shall be referenced by the global call reference.SIST EN 300 403-1 V1.2.2:2005

EN 300 403-1 V1.2.2 (1998-04)9Page 8, subclause 2.4.1.1, subclause headingReplace the subclause heading by the following:2.4.1.1Restart Null (Rest 0)Page 9, subclause 2.4.2.1, subclause headingReplace the subclause heading by the following:2.4.2.1Restart Null (Rest 0)Page 9, clause 3, note 1Delete the last sentence "Annex D ... interfaces".Page 10, table 3-1/Q.931Include SEGMENT as a message in the Miscellaneous messages part of table 3-1/Q.931 with a reference tosubclause 3.5.1.Page 11, table 3-2/Q.931Modify table 3-2/Q.931 as follows:Message type:ALERTINGSignificance:globalDirection:bothInformation elementReferenceDirectionTypeLengthProtocol discriminator4.2bothM1Call reference4.3bothM2 - 3Message type4.4bothM1Bearer capability4.5bothO (note 1)4 - 12Channel identification4.5both (note 2)u ® nO (note 3)2 - 34Progress indicator4.5bothO (note 4)2 - 4Display4.5n ® uO (note 5)2 - 82(note 6)Signal4.5n ® uO (note 7)2 - 3High layer compatibility4.5bothO (note 8)2 - 5NOTE 1:The Bearer capability information element is included when the procedures of subclause 5.11 for bearercapability selection apply. When present, progress description #5 "interworking has occurred and hasresulted in a telecommunication service change" shall also be present.NOTE 2:

Included in the network-to-user direction for support of the procedures in annex D.NOTE 3:Mandatory if this message is the first message in response to SETUP, unless the user accepts theB-channel indicated in the SETUP message.NOTE 4:Included in the event of interworking. Included in the network-to-user direction in connection with theprovision of in-band information/patterns. Included in the user-to-network direction in connection with theprovision of in-band information/patterns if annex K is implemented or in accordance with the proceduresof subclause 5.11.3 and subclause 5.12.3.NOTE 5:Included if the network provides information that can be presented to the user.NOTE 6:The minimum length is 2 octets; the maximum length is network dependent and is either 34 or 82 octets.NOTE 7:

Included if the network optionally provides information describing tones or alerting signals.NOTE 8:The High layer compatibility information element is included when the procedures of subclause 5.12 forhigh layer compatibility selection apply. When present, progress description #5, "interworking hasoccurred and has resulted in a telecommunication service change", shall also be present.SIST EN 300 403-1 V1.2.2:2005

EN 300 403-1 V1.2.2 (1998-04)10Page 12, table 3-3/Q.931Modify table 3-3/Q.931 as follows:Message type:CALL PROCEEDINGSignificance:localDirection:bothInformation elementReferenceDirectionTypeLengthProtocol discriminator4.2bothM1Call reference4.3bothM2 - 3Message type4.4bothM1Bearer capability4.5bothO (note 5)4 - 12Channel identification4.5bothO (note 1)2 - 34Progress indicator4.5bothO (note 2)2 - 4Display4.5n ® uO (note 3)2 - 82(note 4)High layer compatibility4.5bothO (note 6)2 - 5NOTE 1:Mandatory in the network-to-user direction if this message is the first message in response to SETUP.Mandatory in the user-to-network direction if this message is the first message in response to SETUP,unless the user accepts the B-channel indicated in the SETUP message.NOTE 2:Included in the event of interworking. Included in the network-to-user direction in connection with theprovision of in-band information/patterns. Included in the user-to-network direction in connection with theprovision of in-band information/patterns if annex K is implemented or in accordance with the proceduresof subclause 5.11.3 and subclause 5.12.3.NOTE 3:Included if the network provides information that can be presented to the user.NOTE 4:The minimum length is 2 octets; the maximum length is network dependent and is either 34 or 82 octets.NOTE 5:The Bearer capability information element is included when the procedures of subclause 5.11 for bearercapability selection apply. When present, progress description #5 "interworking has occurred and hasresulted in a telecommunication service change", shall also be present.NOTE 6:The High layer compatibility information element is included when the procedures of subclause 5.12 forhigh layer compatibility selection apply. When present, progress description #5, "interworking hasoccurred and has resulted in a telecommunication service change", shall also be present.SIST EN 300 403-1 V1.2.2:2005

EN 300 403-1 V1.2.2 (1998-04)11Page 13, table 3-4/Q.931Modify table 3-4/Q.931 as follows:Message type:CONNECTSignificance:globalDirection:bothInformation elementReferenceDirectionTypeLengthProtocol discriminator4.2bothM1Call reference4.3bothM2 - 3Message type4.4bothM1Bearer capability4.5bothO (note 1)4 - 12Channel identification4.5both (note 2)u ® nO (note 3)2 - 34Progress indicator4.5bothO (note 4)2 - 4Display4.5n ® uO (note 5)2 - 82(note 6)Date/time4.6n ® uO (note 7)2 - 8Signal4.5n ® uO (note 8)2 - 3Low layer compatibility4.5bothO (note 9)2 - 18High layer compatibility4.5bothO (note 10)2 - 5NOTE 1:The Bearer capability information element is included when the procedures of subclause 5.11 for bearercapability selection apply.NOTE 2:

Included in the network-to-user direction for support of the procedures in annex D.NOTE 3:Mandatory if this message is the first message in response to SETUP, unless the user accepts theB-channel indicated in the SETUP message.NOTE 4:Included in the event of interworking or in connection with the provision of in-band information/patterns.NOTE 5:Included if the network provides information that can be presented to the user.NOTE 6:The minimum length is 2 octets; the maximum length is network dependent and is either 34 or 82 octets.NOTE 7:As a network option, may be included to provide date and time information to the calling user for all callsor for calls involving specific telecommunication services.NOTE 8:

Included if the network optionally provides information describing tones.NOTE 9:Included in the user-to-network direction when the answering user wants to return low layer compatibilityinformation to the calling user. Included in the network-to-user direction if the user awarded the callincluded a Low layer compatibility information element in the CONNECT message. Optionally includedfor low layer compatibility negotiation, but some networks may not transport this information element tothe calling user (see annex J).NOTE 10:The High layer compatibility information element is included when the procedures of subclause 5.12 forhigh layer compatibility selection apply.Page 14, table 3-5/Q.931Modify table 3-5/Q.931 as follows:Message type:CONNECT ACKNOWLEDGESignificance:localDirection:bothInformation elementReferenceDirectionTypeLengthProtocol discriminator4.2bothM1Call reference4.3bothM2 - 3Message type4.4bothM1Display4.5n ® uO (note 1)2 - 82(note 2)Signal4.5n ® uO (note 3)2 - 3NOTE 1:Included if the network provides information that can be presented to the user.NOTE 2:The minimum length is 2 octets; the maximum length is network dependent and is either 34 or 82 octets.NOTE 3:

Included if the network optionally provides additional information describing tones.SIST EN 300 403-1 V1.2.2:2005

EN 300 403-1 V1.2.2 (1998-04)12Page 15, table 3-6/Q.931Modify table 3-6/Q.931 as follows:Message type:DISCONNECTSignificance:globalDirection:bothInformation elementReferenceDirectionTypeLengthProtocol discriminator4.2bothM1Call reference4.3bothM2 - 3Message type4.4bothM1Cause4.5bothM4 - 32Progress indicator4.5(note 1)n ® uO (note 2)2 - 4Display4.5n ® uO (note 3)2 - 82(note 4)Signal4.5n ® uO (note 5)2 - 3NOTE 1:Included in the network-to-user direction if the network provides in-band tones. See annex D for usage inthe user-to-network direction.NOTE 2:Included by the network if in-band tones are provided. However, the user may include the ProgressIndicator and provide in-band tones (see annex D). In such cases the network will ignore this informationelement and will not convey the in-band tones.NOTE 3:Included if the network provides information that can be presented to the user.NOTE 4:The minimum length is 2 octets; the maximum length is network dependent and is either 34 or 82 octets.NOTE 5:

Included if the network optionally provides additional information describing tones.SIST EN 300 403-1 V1.2.2:2005

EN 300 403-1 V1.2.2 (1998-04)13Page 16, table 3-7/Q.931Modify table 3-7/Q.931 as follows:Message type:INFORMATIONSignificance:local (note 1)Direction:bothInformation elementReferenceDirectionTypeLengthProtocol discriminator4.2bothM1Call reference4.3bothM2 - 3(note 2)Message type4.4bothM1Sending complete4.5bothO (note 3)1Cause4.5n ® uO (note 9)2 - 32Display4.5n ® uO (note 4)2 - 82(note 5)Keypad facility4.5u ® n(note 10)O (note 6)2 - 34Signal4.5n ® uO (note 7)2 - 3Called party number4.5u ® nbothO (note 8)2 - 23NOTE 1:This message has local significance, but may carry information of global significance.NOTE 2:

This message may be set with the dummy call reference defined in § 4.3 when feature key managementprocedures are used (see Recommendation Q.932); otherwise the minimum length in 2 octets.NOTE 3:Included if the user optionally indicates completion of overlap sending to the network, or if the networkoptionally indicates completion of overlap receiving to the user.NOTE 4:Included if the network provides information that can be presented to the user.NOTE 5:The minimum length is 2 octets; the maximum length is network dependent and is either 34 or 82 octets.NOTE 6:Either the Called party number or the Keypad facility information element is included by the user toconvey called party number information to the network during overlap sending. The Keypad facilityinformation element may also be included if the user wants to convey other call establishment informationto the network or to convey supplementary service information (see clause 7).NOTE 7:

Included if the network optionally provides additional information describing tones.NOTE 8:Eith

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