SIST-TP ETSI/ETR 186-1 E1:2005

• Abstract:

  Definition of the signalling requirements for interaction between IN CS1 services and ISUP/DSS1 switched based services in an N-ISDN environment

• Status: Published
• Publication Date: 31-Mar-2005
• Withdrawal Date: 30-Sep-2003
• ICS: 33.040.35 - Telephone networks
• 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 ETR 186-1 ed.1 (1995-09) - Intelligent Network (IN); Interaction between IN Application Protocol (INAP) and Integrated Services Digital Network (ISDN) signalling protocols; Part 1: Switching signalling requirements for IN Capability Set 1 (CS1) service support in a Narrowband ISDN (N-ISDN) environment

SIST-TP ETSI/ETR 186-1 E1:2005 is a Slovenian technical report from SIST, identical to ETSI ETR 186-1 Edition 1. It specifies signalling requirements for interaction between Intelligent Network (IN) Capability Set 1 (CS1) services and ISUP/DSS1 switched based services in a Narrowband ISDN (N-ISDN) environment, for people implementing or assessing IN service support in telecom networks.

What does SIST-TP ETSI/ETR 186-1 E1:2005 specify?

SIST-TP ETSI/ETR 186-1 E1:2005 sets out how IN CS1 services interact with ISDN signalling when the interaction has to be carried by signalling. The focus is on switched based services in an N-ISDN environment, using the core INAP model as the base.

The scope also points to the second part of ETR 186 for service-transparent out-of-band signalling between an ISDN user and an IN service. The document is organized into scope, references, definitions and abbreviations, general principles, user-to-network communication, and IN-ISDN interworking.

Annex	What it covers
Annex A	Contents of the INAP serviceInteractionIndicators parameter

What are the key requirements of SIST-TP ETSI/ETR 186-1 E1:2005?

The standard is mainly about which signalling information must be exchanged, where it is exchanged, and which network side must act on it. In practice, this tells designers whether a service decision belongs in the SCF, the SSP, or the local exchange.

User interaction and display information

Clause 6 requires support for display information to the calling party and for specific information to the called user at call setup time. This matters when a service needs to show a translated number, service message, or other call-related text at the terminal.

Network configurations for access

Clause 6.3 defines two access cases: an ISDN terminal connected to a local exchange with an SSF, or to one without an SSF. The requirement is that signalling should support both cases, which affects whether the handling stays in DSS1 only or also involves ISUP.

Basic call control and timer handling

Clause 7.1.1 allows the SCF to control Suspend/Resume handling, including the supervision timer in the controlling exchange. Clause 7.1.2 adds user-interaction cases where charging can be modified, the path must be through-connected for in-band information, and call timers must be protected during long user interaction. For implementers, this means the service logic must be able to tell the network how to treat long interactions and charging.

Assist and hand-off support

Clause 7.1.2.4 requires transport of SCF identity and correlation identity for assist/hand-off procedures. This is needed when a service session has to be continued or linked across SSPs.

Service interaction indicators

Clause 7.2.1 introduces the serviceInteractionIndicators parameter as the mechanism for carrying interaction control information in INAP and, when needed, through ISUP. Annex A lists indicators such as call offering, diverting, transfer notification, conference acceptance, and connected number treatment. In practice, these indicators tell exchanges whether to suppress, allow, or reshape supplementary service behaviour.

Supplementary service interworking

Clause 7.2.2 covers SSP-side interaction for calling line identification, connected line identification, explicit call transfer, and call diversion services. Clauses 7.2.3 and 7.2.4 cover terminating and originating exchange behaviour for CFU, CFB, CFNR, conference calling, three party, malicious call identification, and advice of charge. This is the part engineers use to check whether an IN service must block or alter a local supplementary service action.

What terms does SIST-TP ETSI/ETR 186-1 E1:2005 define?

• Intelligent Network (IN) - A network architecture where service logic is separated from basic call handling.
• Intelligent Network Application Protocol (INAP) - The protocol used to carry IN control information between network entities.
• Integrated Services Digital Network (ISDN) - The digital telephony environment in which the signalling interactions are defined.
• Service Control Function (SCF) - The IN entity that holds the service logic and decides how interactions should be handled.
• Service Switching Function (SSF) - The network function that detects IN-triggered events and applies SCF instructions.
• ISDN User Part (ISUP) - The signalling part used between exchanges for call control and related interworking.
• serviceInteractionIndicators - The INAP parameter used to carry per-call instructions about how to handle service interactions.

Who uses SIST-TP ETSI/ETR 186-1 E1:2005?

Telecom network engineers use this standard when designing or integrating IN and ISDN signalling in switching networks. Service developers and switch vendors use it to decide how IN services should interact with call forwarding, identification presentation, conference calling, and charging.

It is also relevant to test labs, quality managers, and operators that need to verify signalling behaviour across SSP, SCF, SRF, OLE, and TLE functions. Buyers and planners can use it to check whether an implementation supports the specific IN CS1 and ISDN interworking they need.

What changed in SIST-TP ETSI/ETR 186-1 E1:2005 from the previous edition?

SIST-TP ETSI/ETR 186-1 E1:2005 is identical to ETR 186-1 Edition 1. The document history identifies the first edition as September 1995.

Which standards are used with SIST-TP ETSI/ETR 186-1 E1:2005?

• ETS 300 374-1 - Provides the core INAP protocol specification that this report builds on.
• CCITT Recommendation E.164 - Supplies the numbering plan used for call routing and number presentation examples.
• ITU-T Recommendation I.112 - Provides the ISDN vocabulary used for the document’s definitions.
• ITU-T Recommendation Q.713 - Provides the SCCP format and code rules used for SCF identity encoding.
• ITU-T Recommendation Q.1290 - Provides intelligent network terminology used in the definitions.
• Second part of ETR 186 - Covers the related service-transparent out-of-band signalling topic mentioned in the scope.

What does the SIST-TP ETSI/ETR 186-1 E1:2005 document contain?

The document contains clauses that describe user-to-network communication, IN and basic call interworking, and IN interaction with switch based supplementary services. Table 1 summarizes which supplementary services are affected and at which network entities the impact appears.

Annex A lists the contents of the INAP serviceInteractionIndicators parameter and maps those indicators to INAP operations in Table A.1. Figure 1 shows the signalling configurations for the access cases discussed in Clause 6.3, which helps readers understand when DSS1 is enough and when ISUP also carries the interaction.

SLOVENSKI STANDARD
01-april-2005
Inteligentno omrežje (IN) - Medsebojno vplivanje med aplikacijskim protokolom
inteligentnega omrežja (INAP) in signalizacijskimi protokoli digitalnega omrežja z
integriranimi storitvami (ISDN) - 1. del: Komutacijske signalizacijske zahteve za
podporo storitvam nabora zmožnosti 1 (CS1) inteligentnega omrežja (IN) v okolju
ozkopasovnega digitalnega omrežja z integriranimi storitvami (N-ISDN)
Intelligent Network (IN); Interaction between IN Application Protocol (INAP) and
Integrated Services Digital Network (ISDN) signalling protocols; Part 1: Switching
signalling requirements for IN Capability Set 1 (CS1) service support in a Narrowband
ISDN (N-ISDN) environment
Ta slovenski standard je istoveten z: ETR 186-1 Edition 1
ICS:
33.040.35 Telefonska omrežja Telephone networks
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.

ETSI ETR 186-1
TECHNICAL September 1995
REPORT
Source: ETSI TC-SPS Reference: DTR/SPS-03011-1
ICS: 33.080
IN, INAP, CS1, ISDN, interaction, signalling
Key words:
Intelligent Network (IN);
Interaction between IN Application Protocol (INAP) and
Integrated Services Digital Network (ISDN) signalling protocols;
Part 1: Switching signalling requirements for
IN Capability Set 1 (CS1) service support in a
Narrowband ISDN (N-ISDN) environment
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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ETR 186-1: September 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 Committee Support Dept." at the address shown on the title page.

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ETR 186-1: September 1995
Contents
Foreword .5
1 Scope .7
2 References.7
3 Definitions and abbreviations .7
4 Abbreviations.7
5 General.8
6 Communication between an ISDN user and the IN entities in the network.8
6.1 Sending of display information to the calling party.8
6.2 Provision of information to the called user.8
6.3 Signalling configurations.9
7 Interworking between IN and ISDN.10
7.1 Interworking between IN and basic call .10
7.1.1 General.10
7.1.1.1 Suspend/Resume .10
7.1.1.2 Preventing of call offering for certain calls.10
7.1.2 Interworking between IN and basic call in case of user interaction.10
7.1.2.1 Modify charging .10
7.1.2.2 Through-connection.10
7.1.2.3 Manipulation on basic call timer supervision .10
7.1.2.4 Support of the assist/hand-off procedures - transport of
SCF identity and correlation identity .10
7.2 Interworking between IN services and switch based services.11
7.2.1 General aspects .11
7.2.2 Interworking at the SSP only .12
7.2.2.1 Calling line identification presentation/restriction.12
7.2.2.2 Connected line identification presentation/restriction .12
7.2.2.3 Explicit call transfer.12
7.2.2.4 Call diversion services.12
7.2.3 Interworking at the terminating exchange .12
7.2.3.1 Suppression of ISDN supplementary services .12
7.2.3.1.1 Call forwarding unconditional.13
7.2.3.1.2 Call forwarding busy .13
7.2.3.1.3 Call forwarding no reply .13
7.2.3.1.4 Conference calling .13
7.2.3.1.5 Three party.13
7.2.3.2 Malicious call identification .13
7.2.4 Interworking at the originating exchange.14
7.2.4.1 Conference calling.14
7.2.4.2 Three party .14
7.2.4.3 Malicious call identification .14
7.2.4.4 Advice of charge.14
Annex A: Contents of the INAP "serviceInteractionIndicators" parameter .15
History.17

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ETR 186-1: September 1995
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ETR 186-1: September 1995
Foreword
This ETSI Technical Report (ETR) has been produced by the Signalling Protocols and Switching (SPS),
Technical Committee of the European Telecommunications Standards Institute (ETSI).
ETRs are informative documents resulting from ETSI studies which are not appropriate for European
Telecommunication Standard (ETS) or Interim European Telecommunication Standard (I-ETS) status. An
ETR may be used to publish material which is either of an informative nature, relating to the use or the
application of ETSs or I-ETSs, or which is immature and not yet suitable for formal adoption as an ETS or
an I-ETS.
This ETR is part 1 of a multi-part ETR covering the interactions between the Intelligent Network
Application Protocol (INAP) and Integrated Services Digital Network (ISDN) signalling protocols as
described below:
Part 1: "Switching signalling requirements for IN Capability Set 1 (CS1) service support in a
Narrowband ISDN (N-ISDN) environment";
Part 2: "Switching signalling requirements for IN Capability Set 2 (CS2) service support in a
Narrowband ISDN (N-ISDN) environment".
NOTE: Additional parts may cover further development in the IN area.
The standardization works in the fields of ISDN and IN have progressed as parallel, independent activities.
Hence no consideration has been given to the provision of IN based services in an ISDN environment.
This ETR seeks to give guidance and clarification to the signalling requirements needed to fully support IN
Capability Set 1 (CS1) services in a Narrowband ISDN (N-ISDN) environment.

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ETR 186-1: September 1995
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ETR 186-1: September 1995
1 Scope
This ETSI Technical Report (ETR) is the first part of a multi-part ETR specifying the signalling
requirements for the interaction between Intelligent Network (IN) and Integrated Services Digital Network
(ISDN).
This ETR specifies the signalling requirements for the interaction between IN Capability Set 1 (CS1)
services and ISDN User Part (ISUP)/Digital Subscriber Signalling System No. one (DSS1) protocol switch
based services in case these interactions have to be supported by signalling. It is based on the ETSI core
Intelligent Network Application Protocol (INAP) as specified in ETS 300 374-1 [1].
Signalling requirements for a service-transparent out-of-band signalling for the interaction of an ISDN user
with an IN service are specified in the second part ETR 186.
2 References
This ETR incorporates by dated and undated reference, provisions from other publications. These
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 ETR
only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies.
[1] ETS 300 374-1 (1994): "Intelligent Network (IN); Intelligent Network Capability
Set 1 (CS1); Core Intelligent Network Application Protocol (INAP); Part 1:
Protocol specification".
[2] CCITT Recommendation E.164 (1991): "Numbering plan for the ISDN era".
[3] ITU-T Recommendation I.112 (1993): "Vocabulary of terms for ISDNs".
[4] ITU-T Recommendation Q.713 (1993): "Signalling System No.7 - SCCP formats
and codes".
[5] ITU-T Recommendation Q.1290 (1993): "Glossary of terms used in the
definition of intelligent networks".
3 Definitions and abbreviations
For the purposes of this ETR, the definitions given in ITU-T Recommendations I.112 [3] and Q.1290 [5]
apply.
4 Abbreviations
For the purposes of this ETR, the following abbreviations apply:
ACM Address Complete Message (ISUP message)
ANM Answer Message (ISUP message)
CCC Credit Card Calling
CCF Call Control Function
CFB Call Forwarding Busy
CFNR Call Forwarding No Reply
CFU Call Forwarding Unconditional
COLP Connected Line identification Presentation
COLR Connected Line identification Restriction
CS1 Capability Set 1
DTMF Dual Tone Multi-Frequency
DSS1 Digital Subscriber Signalling System No. one
ID Identity
IN Intelligent Network
INAP Intelligent Network Application Protocol
IP Intelligent Peripheral
ISDN Integrated Services Digital Network

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ETR 186-1: September 1995
ISUP ISDN User Part
OLE Originating Local Exchange
PRM Premium Rate
N-ISDN Narrowband ISDN
SCF Service Control Function
SCP Service Control Point
SRF Specialized Resource Function
SSF Service Switching Function
SSP Service Switching Point
TE Terminal Equipment
TLE Terminating Local Exchange
UAN Universal Access Number
UPT Universal Personal Telecommunication
VCC Virtual Card Calling
VOT Televoting
VPN Virtual Private Network
5 General
The signalling requirements specified in this ETR are related to the following subjects:
- communication between an ISDN user and the IN entities in the network;
- interworking between IN and ISDN.
In the following clauses these requirements are specified in detail.
6 Communication between an ISDN user and the IN entities in the network
The communication between an ISDN user, i.e. ISDN Terminal Equipment (TE), and the IN entities in the
network includes the transfer of information for the access of an ISDN user for the execution of a service
or a service feature as well as the provision of specific information to the ISDN user.
It is possible, as a general mechanism in the IN architecture, to send tones and announcements to and to
receive additional information in-band from a user (using Dual Tone Multi-Frequency (DTMF) signalling)
by the Specialized Resource Function (SRF) on request of the Service Control Function (SCF) and to
transfer this information via the INAP to the SCF.
For ISDN users this solution requires terminals with a DTMF sender and does not make use of the
possible capabilities of the terminal (for example, to display information provided by the SCF at the user's
terminal). Core INAP only allows the sending of display information to the user.
6.1 Sending of display information to the calling party
For user interaction with the calling party it shall be possible to send display information to the calling
party's terminal. Currently this is supported only when the Service Switching Function/Specialized
Resource Function (SSF/SRF) is integrated in the local exchange. If the SSF/SRF is at the transit
exchange level, an envelope within ISUP is needed to transfer the Display information to the local
exchange that the calling party is connected to and a mechanism to map this information onto the Display
information of DSS1 is needed at the local exchange.
6.2 Provision of information to the called user
As a general requirement it shall be possible to provide specific information only known at the SCF to a
called user when an IN based service is invoked. The information should be presented to the called user
at call setup time.
Called IN number presentation
For some services, e.g. Freephone, Universal Access Number (UAN), it is an option to present the
originally called IN number to the called party.

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ETR 186-1: September 1995
6.3 Signalling configurations
The interaction with an ISDN user should not put any requirements on the network architecture; e.g. it
should not be a requirement to equip the local exchanges with SSF or SRF. As a consequence the
signalling shall support the following two possible configurations for the access of an ISDN TE to the IN
entities in the network:
Case A: The ISDN TE is connected directly to a local exchange with an SSF.
Case B: The ISDN TE is connected to a local exchange without an SSF.
In case A only the DSS1 protocol may be affected by the requirements for a service-transparent signalling.
In case B also the ISUP may be affected.
As an example, figure 1 illustrates these signalling configurations for one of the SRF connect physical
scenarios described in ETS 300 374-1 [1], subclause 7.3.5.1.1 (figure 25, case a).
SCP
Case A
SCF
N on-integrated SR F
Access
Network
Integrated SRF
IN A P
SSP
IP
Access
signalling
SSF
SRF
TE
CCF
Transport
S/T
reference
point
Case B
SCP
SCF
Non-integrated SRF
Integrated SRF
IN A P
SSP
IP
Access
Network
signalling
signalling
SSF
SRF
LE
TE
CCF
Transport Transport
S/T
reference
point
Figure 1: Signalling configurations

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ETR 186-1: September 1995
7 Interworking between IN and ISDN
7.1 Interworking between IN and basic call
7.1.1 General
7.1.1.1 Suspend/Resume
Via a Suspend message ("network initiated") the ISUP call processing may be temporarily interrupted until
a Resume message is received. The time between Suspend/Resume messages is controlled by an
associated ISUP supervision timer in the controlling exchange. The service logic may specify a time value
or the suppression of Suspend/Resume. Therefore, it shall be possible to control this supervision timer via
INAP (SSF is in the controlling exchange).
7.1.1.2 Preventing of call offering for certain calls
Many IN services are usually implemented by a number translation of numbers in a specific number series
into CCITT Recommendation E.164 [2] numbers. The translated numbers are used to route the calls to
the installations of the service subscriber.
For some of these services there may be a requirement, that the service provider should be able to
prevent other calls than those controlled by the Service Control Point (SCP) to be offered at the access of
the service subscriber.
7.1.2 Interworking between IN and basic call in case of user interaction
This subclause identifies the requirements for charging, through-connection and time supervision in case
of an IN based service with user interaction.
7.1.2.1 Modify charging
If an IN based service includes user interaction with the calling party prior to call establishment, it should
be a service option to define whether or not and how the calling party shall be charged for the user
interaction. The ISUP signalling shall support the possibility to modify charging in the Originating Local
Exchange (OLE) on request of the SCF.
7.1.2.2 Through-connection
In case in-band information is to be collected from the user the transmission path needs to be through-
connected in both directions.
7.1.2.3 Manipulation on basic call timer supervision
The originating exchange supervises the receipt of Address Complete Message (ACM) and Answer
Message (ANM) by means of timers. As there should not be any restrictions on how long a user
...