ETSI EN 300 097-1 V1.2.4 (1998-06)

SLOVENSKI STANDARD
SIST EN 300 097-1 V1.2.4:2005
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)
SIST EN 300 097-1 V1.2.4:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 300 097-1 V1.2.4:2005

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SIST EN 300 097-1 V1.2.4:2005
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

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SIST EN 300 097-1 V1.2.4:2005
2 EN 300 097-1 V1.2.4 (1998-06)
Reference
REN/SPS-05145-L1 (0wc90iqo.PDF)
Keywords
ISDN, COLP, DSS1, supplementary service
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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

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SIST EN 300 097-1 V1.2.4:2005
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

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SIST EN 300 097-1 V1.2.4:2005
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

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SIST EN 300 097-1 V1.2.4:2005
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

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SIST EN 300 097-1 V1.2.4:2005
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

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SIST EN 300 097-1 V1.2.4:2005
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

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SIST EN 300 097-1 V1.2.4:2005
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

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SIST EN 300 097-1 V1.2.4:2005
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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The content of this information element is coded as defined in EN 300 403-1 [6], table 4.11.
8 State definitions
No specific state definitions are required.
ETSI

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SIST EN 300 097-1 V1.2.4:2005
10 EN 300 097-1 V1.2.4 (1998-06)
9 Signalling procedures at the coincident S and
T reference point
9.1 Activation, deactivation and registration
Not applicable.
9.2 Actions at the destination user
9.2.1 Normal operation
These procedures shall be provided as part of the basic service and the connected user need not have subscribed to the
COLP supplementary service.
The numbering plan identifier, to be indicated within the connected number information element, sent by the connected
user, shall be either "ISDN/telephony numbering plan (CCITT Recommendations E.164 [4] and E.163 [5])" or
"unknown".
NOTE: Either coding may be used and the treatment of both by the network is identical.
Where the connected number included by the connected user is complete, the type of number to be indicated within the
Connected number information element, sent by the connected user, shall be one of the following:
- "subscriber number", in the case where the complete subscriber number is sent;
- "national number", in the case where the complete national number is sent;
- "international number", in the case where the complete international number is sent.
Where a partial connected number is included by the connected user (e.g. to indicate digits specific to the direct dialling
in or the multiple subscriber number supplementary services) the user shall set the type of number to be indicated within
the Connected number information element to "unknown".
9.2.2 Exceptional procedures
Not applicable.
9.3 Actions at the destination local exchange if a special
arrangement does not apply
9.3.1 Normal operation
These procedures shall be provided as part of the basic service and the connected user need not have subscribed to the
COLP supplementary service.
If multiple CONNECT messages are received from the called user, the network shall only perform the following
procedures when it has decided which CONNECT message to acknowledge.
When a CONNECT message is received from the connected user, the network shall check to see if the Connected number
and Connected subaddress information elements are included.
If the Connected number information element is received with a coding of the numbering plan identifier field other than
"ISDN/telephony numbering plan (CCITT Recommendations E.164 [4] and E.163 [5])" or "unknown", then the network
shall discard the Connected number information element and process the call as if that information element was not
received.
ETSI

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SIST EN 300 097-1 V1.2.4:2005
11 EN 300 097-1 V1.2.4 (1998-06)
At the destination side, the network shall set the value of the screening indicator based on the outcome of the screening of
the connected number. The network shall disregard any value of the screening indicator, if received from the connected
user.
If the Connected number information element is included, the network shall perform the screening function. If the
connected number received from the connected user is determined to be correct, the network shall set the screening
indicator to "user-provided, verified and passed".
NOTE: Some networks may accept a full ISDN number with the addition of a prefix or escape digits to the number
digits field and the type of number field set to "unknown".
If the CONNECT message does not contain the Connected number information element or the screening function has
determined the provided connected number to be incorrect, the network shall use a default number associated with the
connected user. The network shall set the screening indicator to "network provided".
In the case where the connected user provides partial connected number information, and the number is a valid digit
sequence for the user access arrangement, the network shall complete the number as appropriate. The network shall set the
screening indicator to "user-provided, verified and passed".
NOTE: In some cases the network cannot guarantee that the completed number identifies an end user.
If the Connected subaddress information element is available, it shall be passed transparently through the network.
The number digits and the screening indicator, as determined by the procedures above, shall be forwarded to the
originating local exchange, in association with the basic call response.
The presentation indicator, as determined by the procedures of the COLR supplementary service (see
EN 300 098-1 [12]), shall be forwarded to the originating local exchange, in association with the basic call response.
ETSI

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SIST EN 300 097-1 V1.2.4:2005
12 EN 300 097-1 V1.2.4 (1998-06)
The actions at the destination local exchange are summarised in table 1.
Table 1: Information provided by the connected user and by the network
Information provided by the connected user Information provided by the network
Connected number Type of number Connected number Screening Indicator Type of number
received from the (octet 3) forwarded to the calling forward to the calling forwarded to the calling
connected user user if COLR is not user user
(octet 4) activated (octet 3a) (octet 3)
(octet 4)
No connected number Default number stored Network provided "International number"
information element is at the network side or "national number" or
provided by the "unknown"
connected user (notes 1, 7)
Valid part of the number "Unknown" Completion of the User-provided, verified "International number"
not sufficient for number and passed or "national number" or
identifying the (NOTE 3) (note 4) "unknown"
connected user (notes 1, 7)
(note 2)
Correct complete "Subscriber number" or Complete connected User-provided, verified "International number"
connected number "national number" or number and passed or "national number" or
(note 5) "international number" (note 4) "unknown"
(notes 1, 7)
Incorrect number Any type of number Default number stored Network provided "International number"
(note 6) at the network work or "national number" or
side "unknown"
(notes 1, 7)
NOTE 1: A national number shall be converted to an international number at some point in the public network path where
the origination is in a different country.
NOTE 2: This assumes that the user's equipment provides that part of the number pertaining to its own (private) domain.
This may be multiple subscriber number digits provided by a terminal equipment or an extension line number
provided by a private ISDN. The network shall interpret the number digits and check if it is a valid digit sequence
according to the agreements existing between the connected user and the network provider.
NOTE 3: Completion means that the remaining part of the ISDN number associated with
...