SIST EN 300 097-1 V1.2.4:2005

• Abstract:

  Update references from ETS 300 102-1 and associated I-ETSs to ETS 300 403.

• Status: Published
• Publication Date: 31-Mar-2005
• Withdrawal Date: 30-Sep-2003
• 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-Apr-2005
• Due Date: 01-Apr-2005
• Completion Date: 01-Apr-2005
• Ref Project: ETSI EN 300 097-1 V1.2.4 (1998-06) - Integrated Services Digital Network (ISDN); Connected Line Identification Presentation (COLP) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification

SIST EN 300 097-1 V1.2.4:2005 is the Slovenian adoption of the European standard for Connected Line Identification Presentation (COLP) in Integrated Services Digital Network (ISDN) access. It specifies the Digital Subscriber Signalling System No. one (DSS1) protocol for the stage 3 signalling and switching functions that let the calling user receive the identity of the connected party. Engineers, quality managers, and buyers use it to check how equipment handles COLP at the T reference point or coincident S and T reference point, including access through a private ISDN.

What does SIST EN 300 097-1 V1.2.4:2005 specify?

SIST EN 300 097-1 V1.2.4:2005 specifies the DSS1 protocol for the COLP supplementary service in the pan-European ISDN. Its scope covers stage 3 behavior - the signalling procedures and switching functions needed to support the service - for public ISDN access and for access through a private ISDN.

Clause 1 sets the service scope, clause 2 lists the supporting references, and clauses 3 and 4 define terms and abbreviations. Clauses 5 to 14 then cover the service description, operational requirements, coding, signalling procedures, interworking, interactions, timer values, and the SDL-based dynamic description. The informative annexes add signalling flows, terminal interchangeability, change history, and bibliography.

Annex	What it covers
Annex A	Signalling flows
Annex B	Terminal interchangeability between public and private ISDNs
Annex C	Changes with respect to the previous ETS 300 097-1
Annex D	Bibliography

What are the key requirements of SIST EN 300 097-1 V1.2.4:2005?

SIST EN 300 097-1 V1.2.4:2005 defines how the network carries the connected party's identity back to the calling user. In practice, that means the CONNECT message, the connected number, the connected subaddress, and the presentation and screening indicators all have to line up with the service rules in the document.

Service model and information passed to the caller

The COLP supplementary service is offered to the calling user. Clause 5 says it gives the connected user's ISDN number, possibly with subaddress information, and it is an indication of the connected address rather than a dialling check. For implementers, that means the number shown to the caller may describe the party that answered, not just the originally called destination.

Clause 6 says COLP information is inserted in the CONNECT message as part of the basic call procedures. If the connected user does not provide the information, the network uses a default number associated with that access. If the connected user provides a number, the network checks whether it fits the allocated range, and with a special arrangement no verification is performed.

Coding of the connected number and subaddress

Clause 7 defines the Connected number information element and the Connected subaddress information element. Both are carried in codeset 0 and are defined by reference to the base coding in EN 300 403-1. For implementation, this means the COLP service reuses the basic call coding rules instead of inventing a separate transport format.

The connected number element identifies which number is connected to the call, including cases where call diversion changes the number during the call. The connected subaddress element identifies the subaddress of the connected user and is meant to pass through the network transparently.

Destination network handling

Clauses 9.3 and 9.4 describe what the destination local exchange does when a CONNECT message arrives from the connected user. If special arrangement does not apply, the network screens the connected number, discards invalid coding, and may complete a partial number where the access agreement allows it. If special arrangement applies, the network accepts the user-provided number differently and does not perform the same verification step.

In both cases, the network forwards the connected number and screening result toward the originating side, and it passes the connected subaddress transparently when available. For day-to-day practice, this is the part that determines whether the caller sees a network-provided number, a verified user-provided number, or a restricted or unavailable presentation.

Originating network handling

Clause 9.5 defines what the originating local exchange sends to the calling user. If the calling user is subscribed to COLP and presentation is allowed, the network includes the connected number and, if available, the connected subaddress in the CONNECT message. If presentation is restricted or the number is unavailable because of interworking, the network still sends a connected-number element, but with the appropriate presentation status and without the actual digits.

If the calling user is not subscribed to COLP, the network does not include the connected number or connected subaddress. For implementation and testing, this clause is the main check on what the user terminal should receive under normal, restricted, and unavailable presentation conditions.

Interworking and interactions

Clause 10 says private ISDN interworking uses the same procedures as clause 9, with subclause 9.4 especially suitable for attached private networks. Clause 11 covers interaction with other networks and allows several network-rules-based handling options when the destination is not an ISDN. Clause 12 delegates interactions with other supplementary services to EN 300 195-1, and clause 13 states that no specific timers are required.

What terms does SIST EN 300 097-1 V1.2.4:2005 define?

• Connected user - the user at the destination who answers the call and becomes the party whose identity may be presented.
• Served user - the calling user who has subscribed to presentation of connected line identification information.
• Default number - an ISDN number registered in the public ISDN by prior agreement and used when user-provided information is absent or unusable.
• Special arrangement - an agreement that lets customer-supplied connected numbers pass without screening by the public ISDN.
• COLP - Connected Line Identification Presentation, the supplementary service covered by the standard.
• COLR - Connected Line Identification Restriction, the related supplementary service that affects whether presentation is allowed.
• DSS1 - Digital Subscriber Signalling System No. one, the signalling protocol used at the user-network interface.
• ISDN - Integrated Services Digital Network, the network environment in which COLP is specified.

Who uses SIST EN 300 097-1 V1.2.4:2005?

Telecommunications network operators use SIST EN 300 097-1 V1.2.4:2005 to define how their exchanges and access systems handle COLP. Terminal and switching equipment manufacturers use it to implement the CONNECT message behavior, number coding, and presentation rules.

Test laboratories and conformance teams use it together with the later test-specification parts of the same standard family to check protocol behavior. Private ISDN operators and integrators use it to align terminal behavior between public and private ISDN access. Quality managers and buyers use it to confirm that equipment supports the expected connected-number and subaddress handling.

What changed in SIST EN 300 097-1 V1.2.4:2005 from the previous edition?

The foreword says this version updates the references to the basic call specifications and incorporates previous amendments and corrigenda. Annex C lists three specific changes: conversion to EN layout, replacement of references to ETS 300 102 with EN 300 403, and replacement of non-specific basic-standard references with the latest versions.

Which standards are used with SIST EN 300 097-1 V1.2.4:2005?

Reference	What it contributes
CCITT Recommendation I.411	User-network interface reference configurations
CCITT Recommendation I.130	The three-stage method used to describe ISDN supplementary services
CCITT Recommendation I.112	Definitions for ISDN and telecommunications service terminology
CCITT Recommendation E.164	ISDN numbering plan and number structure
CCITT Recommendation E.163	International telephone numbering plan reference
EN 300 403-1	Basic call control protocol and the coding used for the connected number and connected subaddress
EN 300 195-1	Interaction rules between supplementary services
ETS 300 094	Stage 1 service description for COLP
CCITT Recommendation T.50	IA5 character set
CCITT Recommendation Z.100	SDL notation used for the dynamic description
EN 300 098-1	COLR protocol specification used for presentation handling

What does the SIST EN 300 097-1 V1.2.4:2005 document contain?

SIST EN 300 097-1 V1.2.4:2005 contains the service description, operational rules, coding rules, and call-handling procedures needed for COLP in DSS1. It also contains tables that summarize destination local exchange behavior, figures that define the connected number and connected subaddress information elements, and SDL diagrams that show the dynamic behavior at the destination and originating network sides.

Annex A gives signalling flows, Annex B addresses terminal interchangeability between public and private ISDNs, and Annex C records the changes from the previous ETS edition. Annex D provides the bibliography.

SLOVENSKI STANDARD
01-april-2005
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Integrated Services Digital Network (ISDN); Connected Line Identification Presentation
(COLP) supplementary service; Digital Subscriber Signalling System No. one (DSS1)
protocol; Part 1: Protocol specification
Ta slovenski standard je istoveten z: EN 300 097-1 Version 1.2.4
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 300 097-1 V1.2.4 (1998-06)
European Standard (Telecommunications series)
Integrated Services Digital Network (ISDN);
Connected Line Identification Presentation (COLP)
supplementary service;
Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification

2 EN 300 097-1 V1.2.4 (1998-06)
Reference
REN/SPS-05145-L1 (0wc90iqo.PDF)
Keywords
ISDN, COLP, DSS1, supplementary service
ETSI
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Copyright Notification
No 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.
ETSI
3 EN 300 097-1 V1.2.4 (1998-06)
Contents
Intellectual Property Rights. 4
Foreword. 4
1 Scope . 6
2 Normative references. 6
3 Definitions. 7
4 Abbreviations.8
5 Description . 8
6 Operational requirements . 8
6.1 Provision and withdrawal.8
6.2 Requirements on the originating network side.8
6.3 Requirements on the destination network side .8
7 Coding requirements. 8
7.1 Connected number information element .9
7.2 Connected subaddress information element .9
8 State definitions. 9
9 Signalling procedures at the coincident S and T reference point . 10
9.1 Activation, deactivation and registration .10
9.2 Actions at the destination user.10
9.2.1 Normal operation .10
9.2.2 Exceptional procedures.10
9.3 Actions at the destination local exchange if a special arrangement does not apply.10
9.3.1 Normal operation .10
9.3.2 Exceptional procedures.12
9.4 Actions at the destination local exchange if a special arrangement applies .12
9.4.1 Normal operation .12
9.4.2 Exceptional procedures.13
9.5 Actions at the originating local exchange.14
9.5.1 Normal operation .14
9.5.2 Exceptional procedures.14
10 Procedures for interworking with private ISDNs . 14
11 Interaction with other networks . 14
12 Interaction with other supplementary services. 15
13 Parameter values (timers). 15
14 Dynamic description (SDL diagrams). 16
Annex A (informative): Signalling flows . 18
Annex B (informative): Terminal interchangeability between public and private ISDNs. 19
Annex C (informative): Changes with respect to the previous ETS 300 097-1 . 20
Annex D (informative): Bibliography. 21
History. 22
ETSI
4 EN 300 097-1 V1.2.4 (1998-06)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in
SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect
of ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on the
ETSI Web server (http://www.etsi.fr/ipr or http://www.etsi.org/ipr).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can
be given as to the existence of other IPRs not referenced in SR 000 314 (or the updates on the ETSI Web server) which
are, or may be, or may become, essential to the present document.
Foreword
This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Signalling
Protocols 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) Connected Line Identification Presentation
(COLP) supplementary service, as described below:
Part 1: "Protocol specification";
Part 2: "Protocol Implementation Conformance Statement (PICS) proforma specification";
Part 3: "Test Suite Structure and Test Purposes (TSS&TP) specification for the user";
Part 4: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT)
proforma specification for the user";
Part 5: "Test Suite Structure and Test Purposes (TSS&TP) specification for the network";
Part 6: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT)
proforma specification for the network".
In accordance with CCITT Recommendation I.130, the following three level structure is used to describe the
supplementary telecommunications services as provided by European public telecommunications operators under the pan-
European Integrated Services Digital Network (ISDN):
- Stage 1: is an overall service description, from the user's standpoint;
- Stage 2: identifies the functional capabilities and information flows needed to support the service described in
stage 1; and
- Stage 3: defines the signalling system protocols and switching functions needed to implement the service described
in stage 1.
The present document details the stage three aspects (signalling system protocols and switching functions) needed to
support the Connected Line Identification Presentation (COLP) supplementary service. The stage one and stage two
aspects are detailed in ETS 300 094 and ETS 300 096, respectively.
The present version updates the references to the basic call specifications and incorporates all previous amendments and
corrigenda.
ETSI
5 EN 300 097-1 V1.2.4 (1998-06)
National transposition dates
Date of adoption of this EN: 19 June 1998
Date of latest announcement of this EN (doa): 30 September 1998
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 March 1999
Date of withdrawal of any conflicting National Standard (dow): 31 March 1999
ETSI
6 EN 300 097-1 V1.2.4 (1998-06)
1 Scope
This first part of EN 300 097 specifies the stage three of the Connected Line Identification Presentation (COLP)
supplementary service for the pan-European Integrated Services Digital Network (ISDN) as provided by European public
telecommunications operators at the T reference point or coincident S and T reference point (as defined in CCITT
Recommendation I.411 [1]) by means of the Digital Subscriber Signalling System No. one (DSS1) protocol. Stage three
identifies the protocol procedures and switching functions needed to support a telecommunications service (see CCITT
Recommendation I.130 [2]).
In addition the present document specifies the protocol requirements at the T reference point where the service is
provided to the user via a private ISDN.
The present document does not specify the additional protocol requirements where the service is provided to the user via
a telecommunications network that is not an ISDN.
The COLP supplementary service provides the calling party with the possibility to receive identification of the connected
party, and is applicable to all circuit-switched telecommunications services.
Further parts of the present document specify the method of testing required to identify conformance to the present
document.
The present document is applicable to equipment, supporting the COLP supplementary service, to be attached at either
side of a T reference point or coincident S and T reference point when used as an access to the public ISDN.
2 Normative references
References may be made to:
a) specific versions of publications (identified by date of publication, edition number, version number, etc.), in which
case, subsequent revisions to the referenced document do not apply; or
b) all versions up to and including the identified version (identified by "up to and including" before the version
identity); or
c) all versions subsequent to and including the identified version (identified by "onwards" following the version
identity); or
d) 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 same
number.
[1] CCITT Recommendation I.411 (1988): "ISDN user-network interfaces Reference configurations".
[2] CCITT Recommendation I.130 (1988): "Method for characterisation of telecommunications services
supported by an ISDN and network capabilities of an ISDN".
[3] CCITT Recommendation I.112: "Vocabulary of terms for ISDNs".
[4] CCITT Recommendation E.164: "Numbering plan for the ISDN era".
[5] CCITT Recommendation E.163 (1988): "Numbering plan for the international telephone service".
[6] EN 300 403-1: "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]".
[7] EN 300 195-1: "Integrated Services Digital Network (ISDN); Supplementary service interactions;
Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification".
[8] CCITT Recommendation I.210: "Principles of telecommunication services supported by an ISDN
and the means to describe them".
ETSI
7 EN 300 097-1 V1.2.4 (1998-06)
[9] ETS 300 094 (1992): "Integrated Services Digital Network (ISDN); Connected Line Identification
Presentation (COLP) supplementary service; Service description".
[10] CCITT Recommendation T.50 (1988): "International Alphabet No. 5".
[11] CCITT Recommendation Z.100 (1988): "Functional Specification and Description Language
(SDL)".
[12] EN 300 098-1: "Integrated Services Digital Network (ISDN); Connected Line Identification
Restriction (COLR) supplementary service; Digital Subscriber Signalling System No. one (DSS1)
protocol; Part 1: Protocol specification".
3 Definitions
For the purpose of the present document, the following definitions apply:
address: The ISDN number of the connected user, and a subaddress if provided by that user.
connected number: The ISDN number of the connected user.
connected user: It is the user that responded to the served user call request at the destination network and has been
awarded the call by the network. The connected user need not have subscribed to the COLP supplementary service.
default number: An ISDN number registered within the public ISDN following prior agreement between the connected
user and the public ISDN.
IA5 characters: See CCITT Recommendation T.50 [10].
Integrated Services Digital Network (ISDN): See CCITT Recommendation I.112 [3], § 2.3, definition 308.
international number: An ISDN number structured as specified in § 3.2 (the paragraphs relating to international number)
of CCITT Recommendation E.164 [4].
ISDN number: A number conforming to the numbering plan and structure specified in CCITT Recommendation E.164 [4].
national number; national significant number: An ISDN number structured as specified in § 3.2 (the paragraphs relating
to national significant number) of CCITT Recommendation E.164 [4].
network: The DSS1 protocol entity at the network side of the user-network interface.
served user: It is the user of a particular ISDN number who has subscribed to the presentation of the connected line
identification information in association with outgoing calls. The served user is also known as the calling user.
service; telecommunications service: See CCITT Recommendation I.112 [3], § 2.2 definition 201.
special arrangement: An agreement between a customer and a public network operator whereby customer supplied
connected numbers are not screened by the public ISDN.
subaddress: See CCITT Recommendation E.164 [4], § 11.2.
subscriber number: An ISDN number structured as specified in § 3.2 (the paragraphs relating to subscriber number) of
CCITT Recommendation E.164 [4].
supplementary service: See CCITT Recommendation I.210 [8], § 2.4.
user: The DSS1 protocol entity at the user side of the user-network interface.
ETSI
8 EN 300 097-1 V1.2.4 (1998-06)
4 Abbreviations
For the purposes of the present document, the following abbreviations apply:
COLP Connected Line Identification Presentation
COLR Connected Line Identification Restriction
DSS1 Digital Subscriber Signalling System No. one
IA5 International Alphabet No. 5
ISDN Integrated Services Digital Network
5 Description
The COLP supplementary service is a supplementary service offered to the calling user. It provides the connected user's
ISDN number, possibly with subaddress information to the calling user.
The COLP supplementary service is not a dialling check but an indication to the calling subscriber of the connected
address. In a full ISDN environment, the connected line identity shall include all the information necessary to
unambiguously identify the connected line.
The connected line identity may include the Connected subaddress information element generated by the connected user
which shall be transparently transported by the network. The network cannot be responsible for the content of this
connected subaddress.
6 Operational requirements
6.1 Provision and withdrawal
See ETS 300 094 [9], subclause 6.1.
6.2 Requirements on the originating network side
See subclause 9.5.
6.3 Requirements on the destination network side
All information pertaining to the COLP supplementary service shall be inserted in the CONNECT message sent as part of
the basic call procedures according to EN 300 403-1 [6], clause 5.
In the case where no information is provided by the connected user (as part of the basic call procedures) the network shall
provide the default number associated with the connected user's access in the destination local exchange.
When the connected number information is provided by the connected user, the network can only verify that the number is
within the set of numbers allocated to that user.
Where a special arrangement exists with the connected user, no verification shall be performed.
7 Coding requirements
This clause gives the coding for the Connected number and the Connected subaddress information elements which are
required to support this service.
ETSI
9 EN 300 097-1 V1.2.4 (1998-06)
7.1 Connected number information element
The purpose of the Connected number information element is to indicate which number is connected to a call. The
connected number(s) may be different from the called party number(s) because of changes (e.g. call diversion) during the
lifetime of a call.
The Connected number information element is coded as shown in figure 1. The maximum length of this information
element is 24 octets.
This information element belongs to codeset 0.

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The content of this information element is coded as defined in EN 300 403-1 [6], table 4.10.
7.2 Connected subaddress information element
The purpose of the Connected subaddress information element is to identify the subaddress of the connected user of a call.
The connected subaddress may be different from a called user subaddress because of changes (e.g. call diversion) during
the lifetime of the call.
The Connected subaddress information element is coded as shown in figure 2. The maximum length of this information
element is 23 octets.
This information element belongs to codeset 0.

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