ETSI ETS 300 334 ed.1 (1995-12)

Integrated Services Digital Network (ISDN); Signalling System No.7; Routeing in support of ISDN User Part (ISUP) version 2 services

DE/NA-022108

Digitalno omrežje z integriranimi storitvami (ISDN) – Signalizacija št. 7 – Usmerjanje kot podpora storitvam uporabniškega dela sistema ISDN (ISUP), različica 2

General Information

• Status: Published
• Publication Date: 18-Dec-1995
• Technical Committee: NA 2 - Numbering, Addressing, Routeing & Interworking
• Current Stage: 12 - Completion
• Due Date: 26-Feb-1996
• Completion Date: 19-Dec-1995
• Ref Project: SIST ETS 300 334 E1:2003 - Integrated Services Digital Network (ISDN); Signalling System No.7; Routeing in support of ISDN User Part (ISUP) version 2 services

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 334 E1:2003
01-december-2003
'LJLWDOQRRPUHåMH]LQWHJULUDQLPLVWRULWYDPL,6'1±6LJQDOL]DFLMDãW±
8VPHUMDQMHNRWSRGSRUDVWRULWYDPXSRUDEQLãNHJDGHODVLVWHPD,6'1,683
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Integrated Services Digital Network (ISDN); Signalling System No.7; Routeing in support
of ISDN User Part (ISUP) version 2 services
Ta slovenski standard je istoveten z: ETS 300 334 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST ETS 300 334 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 334 E1:2003

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SIST ETS 300 334 E1:2003
EUROPEAN ETS 300 334
TELECOMMUNICATION December 1995
STANDARD
Source: ETSI TC-NA Reference: DE/NA-022108
ICS: 33.040
ISDN, ISUP, routeing, SS7
Key words:
Integrated Services Digital Network (ISDN);
Signalling System No.7;
Routeing in support of ISDN User Part (ISUP) version 2 services
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - [e-mail]
X.400: Internet:
Tel.: [phone] - Fax: [phone]
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 1995. All rights reserved.
New presentation - see History box

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ETS 300 334: December 1995
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Standards Approval Dept." at the address shown on the title page.

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ETS 300 334: December 1995
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Abbreviations.7
4 Additions and/or Clarifications to CCITT Recommendation E.172 .8
4.1 CCITT Recommendation E.172, subclause 10: Signalling capability.8
4.2 CCITT Recommendation E.172, subclause 7(k): Connection history .8
4.3 CCITT Recommendation E.172, subclause 8: Relationship between requested
services and transmission medium requirement values.8
4.4 CCITT Recommendation E.172, annex 1.8
4.5 CCITT Recommendation E.172, annex 3.8
5 Additional information on parameters used for routeing .8
5.1 Use of the transmission medium requirement parameter .8
5.1.1 Use of the TMR value "64 kbit/s unrestricted preferred".9
5.1.2 Multirate connection types.9
5.2 Relationship between requested service and TMR values.9
5.3 ISUP preference indicator values for ISDN services .10
5.3.1 Services requiring "ISUP required".11
5.3.2 Services requiring ISUP preferred.11
5.3.3 Services requiring "ISUP not required".11
5.4 Evaluation of the propagation delay counter for routeing purposes.11
5.4.1 General.11
5.4.2 Limits and actions.11
5.5 DCME links and their influence on routeing.11
6 Impact of services interworking, terminal interworking and fallback on routeing .12
7 Selection of path/traffic distribution .14
Annex A (informative): Examples of the effect of PD and DCME on routeing .16
Annex B (informative): Background information on propagation delay.17
B.1 General.17
B.2 Transmission mediums and systems taking a considerable propagation delay .17
B.3 Indication of mobile originated calls .17
B.4 Routeing for mobile originated calls .17
B.5 Threshold .17
B.6 Examples of calculation of the 70 ms threshold.18
Annex C (informative): Bibliography.19
History.20

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ETS 300 334: December 1995
Foreword
This European Telecommunication Standard (ETS) has been prepared by the Network Aspects (NA)
Technical Committee of the European Telecommunications Standards Institute (ETSI), and is now
submitted for the Voting phase of the ETSI standards approval procedure.
This ETS is based upon the following source documents:
- CCITT Recommendation E.172 [1]; and
- ETS 300 100 [2].
Transposition dates
Date of adoption of this ETS: 17 November 1995
Date of latest announcement of this ETS (doa): 29 February 1996
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 August 1996
Date of withdrawal of any conflicting National Standard (dow): 31 August 1996

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1 Scope
This European Telecommunication Standard (ETS) gives guidance on international call routeing during
the implementation of the Integrated Services Digital Network (ISDN) User Part version 2 of signalling
system No. 7 (ISDN User Part (ISUP) version 2) in the European ISDN (see ETS 300 356-1 [3]).
This ETS is applicable to the functions required at ISDN international gateways and international transit
exchanges for routeing and network planning in order to achieve practical international interconnection of
networks.
The relevant CCITT routeing Recommendation is identified and clarifications and additions to this are
provided, where necessary. In addition, CCITT Recommendations E.170 and E.171 need to be
considered.
This ETS covers services offered during the implementation of ISDN, using ISUP version 2 in the
international network. The list of services can be found in table 2 of this ETS.
2 Normative references
This ETS incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest
edition of the publication referred to applies.
[1] CCITT Recommendation E.172 (1992): "ISDN Routing Plan".
[2] ETS 300 100: "Integrated Services Digital Network (ISDN); Routing in support of
ISUP version 1 services".
[3] ETS 300 356-1: "Integrated Services Digital Network (ISDN); Signalling System
No.7; ISDN User Part (ISUP) version 2 for the international interface; Part 1:
Basic services [ITU-T Recommendations Q.761 to Q.764 (1993), modified]".
3 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
CUG Closed User Group
DCME Digital Circuit Multiplication Equipment
DTX Discontinuous Transmission
GMSC Gateway Mobile Switching Centre
ISC International Switching Centre
IDN Integrated Digital Network
IPI ISUP Preference Indicator
ISDN Integrated Services Digital Network
ISUP ISDN User Part
MOC Mobile Originated Call
PD Propagation Delay
PDC Propagation Delay Counter
PLMN Public Land Mobile Network
PSTN Public Switched Telephone Network
PSPDN Public Switched Packet Data Network
TMR Transmission Medium Requirement
TUP Telephone User Part
TUP+ Enhanced Telephone User Part

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4 Additions and/or Clarifications to CCITT Recommendation E.172
4.1 CCITT Recommendation E.172, subclause 10: Signalling capability
Subclause 5.3 of this ETS contains the application of the criteria for setting the ISUP Preference Indicator
(IPI) parameter for the implementation of ISDN in Europe for ISUP version 2.
4.2 CCITT Recommendation E.172, subclause 7(k): Connection history
Subclause 5.4 of this ETS contains the application of the Propagation Delay Counter (PDC) for routeing
purposes and subclause 5.5 describes the influence of Digital Circuit Multiplication Equipment (DCME)
links on routeing in ISUP version 2.
4.3 CCITT Recommendation E.172, subclause 8: Relationship between requested services
and transmission medium requirement values
The information in CCITT Recommendation E.172 [1], subclause 8 is extended in subclauses 5.1 and 5.2
of this ETS, to cover the implementation of ISDN in Europe for ISUP version 2. The service interworking
situation from the Public Switched Telephone Network (PSTN) to the ISDN is further detailed in clause 6
of this ETS.
4.4 CCITT Recommendation E.172, annex 1
The application of the criteria defined in CCITT Recommendation E.172 [1], annex 1, to the
implementation of ISDN in Europe for ISUP version 2 is specified in subclause 5.3 of this ETS.
4.5 CCITT Recommendation E.172, annex 3
The application of parts of the criteria defined in CCITT Recommendation E.172 [1], annex 3, this annex
to the implementation of ISDN in Europe for ISUP version 2 is specified and extended in clause 6 of this
ETS.
5 Additional information on parameters used for routeing
5.1 Use of the transmission medium requirement parameter
The use of the ISUP Transmission Medium Requirement (TMR) parameter for routeing is described in
CCITT Recommendation E.172 [1], subclause 7 g). In addition to the statements made in CCITT
Recommendation E.172 [1], the following shall apply:
- for a specific service request, one TMR value shall be used in the international network and across
internetwork boundaries. The changing of TMR values shall only be allowed when fall-back occurs.
For its value, see subclause 5.2.
It is recommended that national networks use the same TMR values as the international network.
Conversion from the requested service to the TMR value can then be performed in the originating local
exchange. If not done there, then the TMR shall be available at the outgoing international gateway and
onwards. It shall then be forwarded to following exchanges, if possible, even up to the destination
exchange.
At international transit exchanges, as well as at incoming international gateway exchanges, the TMR shall
be examined for routeing purpose, irrespective of the service requested. This does not preclude that
incoming gateway exchanges may need to examine additional information available to determine national
routeing.

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5.1.1 Use of the TMR value "64 kbit/s unrestricted preferred"
In addition to the TMR values mentioned in CCITT Recommendation E.172 [1], subclause 8, a new TMR
value has been created for the purpose of indicating when fall-back from 64 kbit/s unrestricted to speech
or 3,1 kHz audio is allowed. The value of this TMR is "64 kbit/s unrestricted preferred".
The settings and the procedure at an interworking point for this TMR value are described in subclause
7.3.35 of ETS 300 356-1 [3].
If, at an interworking point, there is no route available supporting TMR "64 kbit/s unrestricted preferred",
then the fallback procedure should be carried out at this point.
5.1.2 Multirate connection types
Multirate connections are multiple circuit switched connections (n x 64 kbit/s) with a bandwidth between
128 kbit/s and 1 920 kbit/s.
n x 64 kbit/s connections are restricted to operate within a 2 Mbit/s system. The following TMR values are
given in ETS 300 356-1 [3]:
- 2 x 64 kbit/s unrestricted (not used);
- 384 kbit/s unrestricted;
- 1 536 kbit/s unrestricted;
- 1 920 kbit/s unrestricted.
5.2 Relationship between requested service and TMR values
Table 1 gives TMR values for ISDN services to be used across international and internetwork boundaries.

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Table 1
TMR value
Requested Service speech 3,1 kHz 64 kbit/s 64 kbit/s
audio unrestricted unrestricted
preferred
(note 3)
64 kbit/s unrestricted X
3,1 kHz audio X
Bearer speech X
service Packet mode case A:B-c X
(note 1)
Packet mode case B:B-c X
(note 1)
Packet mode case B:D-c X
(notes 1, 2)
Telephony 3,1 kHz X
Telefax Group 4 X
Teletex X
7 kHz telephony without fall-back X
Tele
service 7 kHz telephony with fall-back X
(note 3
...