ETSI TR 101 886 V1.1.1 (2002-02)

SLOVENSKI STANDARD
01-april-2004
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Telecommunications and Internet Protocol Harmonization Over Networks (TIPHON);
Requirements Definition Study; Real time aspects of a resolution service
Ta slovenski standard je istoveten z: TR 101 886 Version 1.1.1
ICS:
33.020 Telekomunikacije na splošno Telecommunications in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

Technical Report
Telecommunications and Internet Protocol
Harmonization Over Networks (TIPHON);
Requirements Definition Study;
Real time aspects of a resolution service

2 ETSI TR 101 886 V1.1.1 (2002-02)

Reference
DTR/TIPHON-04008
Keywords
addressing, ID, IP, network, service
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© European Telecommunications Standards Institute 2001.
All rights reserved.
ETSI
3 ETSI TR 101 886 V1.1.1 (2002-02)
Contents
Intellectual Property Rights.4
Foreword.4
1 Scope.5
2 References.5
3 Definitions and abbreviations.5
3.1 Definitions.5
3.2 Abbreviations.6
4 Overview.7
4.1 Completing the call from home network to terminating network.10
5 Functional requirements for the ARDB .11
5.1 Service provider management.11
5.1.1 Service provider profile .11
5.1.2 Access control.11
5.1.3 Access methods.12
5.2 Subscriber record management .12
5.2.1 Subscriber record.12
5.2.2 Access control.12
5.2.3 Access methods.12
5.3 Number management.12
5.3.1 Number assignment.12
5.3.2 Number recall.13
5.3.3 States of a number .13
5.3.4 Service disconnect.13
5.3.5 Problem solving.13
5.3.6 Subscriber support.13
5.4 Number portability considerations .13
5.4.1 Verification of the provisioning request .14
5.4.2 Activation of the provisioning request.14
5.4.3 Confirmation of the old service provider.14
5.4.4 Conflict resolution.14
5.4.5 Order cancellation.14
6 Requirements for the RTDB.15
6.1 General.15
6.2 HNN.15
6.3 Scalability.15
6.4 Availability.15
6.5 Session.16
6.6 Performance.16
6.7 Security.16
History .17

ETSI
4 ETSI TR 101 886 V1.1.1 (2002-02)
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 ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://webapp.etsi.org/IPR/home.asp).
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 ETSI 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 Technical Report (TR) has been produced by ETSI Project Telecommunications and Internet Protocol
Harmonization Over Networks (TIPHON).
TIPHON Resolution Capability (TRC) is a centralized resolution mechanism for inter-service provider call routing in
TIPHON compliant networks. Its main function is to map an E.164 number to a unique service provider name called a
Home Network Name (HNN). This HNN can be further resolved into network address(es) of the next-hop service
provider network elements by the local resolution capability of the current service provider (which is outside of TRC).
In this way, TRC allows call signalling to be routed hop-by-hop, through multiple service provider networks, to the
terminating service provider network, where call signalling is routed to the destination terminal identified by the E.164
number.
At the heart of TRC is the database that stores the mapping from an E.164 number to an HNN of a service provider.
There are two different parts of the TRC database operations: administrative and real-time. The administrative part
deals with the required processes and procedures for administering E.164 numbers and service provider data, while the
real-time part allows the originating service provider to query the database to determine the HNN of the home service
provider serving the E.164 number.
It should be noted that although the TRC was originally developed to support an international UPT service, the concepts
and technology infrastructure are equally applicable to other TIPHON applications, including national variants. The
present document has been written to describe a generic resolution framework from which different scenarios can be
derived. In some cases, specific features may need to be added to make it suitable for particular applications.
NOTE: For certain numbering ranges/types of service, a centralized resolution mechanism of the type offered by
TRC is not a mandatory feature of TIPHON compliant networks. In those network scenarios, routing
between originating and terminating networks may be carried out on a hop-by-hop basis, using a
resolution function embedded in each of the networks traversed.
ETSI
5 ETSI TR 101 886 V1.1.1 (2002-02)
1 Scope
The present document describes the requirements and definitions for the administrative and real-time aspects of the
TIPHON Resolution Capability (TRC).
TIPHON Resolution Capability (TRC) is a centralized resolution mechanism for inter-service provider call routing in
TIPHON compliant networks. In terms of the general framework given in TR 101 326, the TRC is an objective service
resolution. Its main function is to map an E.164 number to a unique service provider name called a Home Network
Name (HNN). The administrative part deals with the required processes and procedures for administering E.164
numbers and service provider data, while the real-time part allows the originating service provider to query the database
to determine the HNN of the home service provider serving the E.164 number. It should be noted that although the TRC
was originally developed to support an International UPT service, the concepts and technology infrastructure are
equally applicable to other TIPHON applications, including national variants.
The present document provides the basis for the Resolution Service capability in TS 101 878. At the same time, the
present document can also be used as a stand-alone document.
2 References
For the purposes of this Technical Report (TR), the following references apply:
[1] ITU-T Recommendation E.164: "The international public telecommunication numbering plan".
[2] ITU-T Recommendation E.168: "Application of E.164 numbering plan for UPT".
[3] ITU-T Recommendation Q.1290: "Glossary of terms used in the definition of intelligent
networks".
[4] ETSI TS 101 314: "Telecommunications and Internet Protocol Harmonization Over Networks
(TIPHON); Network architecture and reference configurations; TIPHON Release 2".
[5] ETSI TR 101 326: "Telecommunications and Internet Protocol Harmonization Over Networks
(TIPHON); the procedure for determining IP addresses for routeing packets on interconnected IP
networks that support public telephony".
[6] ETSI TS 101 878: "Telecommunications and Internet Protocol Harmonization Over Networks
(TIPHON) Release 3; Service Capability Definition; Service Capabilities for a simple call".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
Administrative Reference DataBase (ARDB): centralized database used for storing the master copy of E.164 number
to HNN mapping that will be periodically downloaded to RTDBs for real-time query
NOTE: Service providers can create, update and delete records of E.164 number to HNN mapping in this
database. It also contains the participating service provider profiles, which can be created, updated and
deleted by the TRC administrators. There is logically exactly one ARDB per TRC.
availability: probability that a system can perform the required function at a given instant of time
NOTE: It is estimated by the ratio of actual service time to scheduled service time, and is expressed as
percentage, or equivalently, as average downtime per year.
database sizing: storage capacity of a database system, usually measured as the number of records with respect to a
specific record size
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6 ETSI TR 101 886 V1.1.1 (2002-02)
home network: network that supports the service to which a customer subscribes
Home Network Name (HNN): unique identifier/name for a service provider
NOTE: An HNN may be further resolved to a routable network address of the service provider by means outside
of TRC.
home service provider of an E.164 number: service provider that provides the telephony services to the subscriber of
the E.164 number
Number Allocation Authority (NAA): national or international organization being responsible for issuing telephone
numbers to service providers and/or individual subscribers
query response time: between the last bit of query entering the database and the last bit of response going out of the
database
NOTE: In other words, query response time only concerns the database query processing time, excluding the
transmission delay incurred by the network between the querying entity and the database.
Real-Time DataBase (RTDB): database that contains a copy of the E.164 number to service provider HNN mapping
from ARDB for real-time query by service providers
NOTE: RTDB is read-only by service providers, and its content is updated periodically by ARDB download.
There can be more than one RTDB in a TRC, some of which may reside inside a service provider
network.
resolution domain: group of service providers that agree to provide inter-carrier telephony services over a specific
E.164 numbering range/type
NOTE: There shall be one TRC per resolution domain.
throughput: number of queries per second the database which is able to perform with respect to a certain load
condition
TIPHON Resolution Capability (TRC): mapping function from E.164 numbers to HNNs
NOTE: Also refers to the set of network elements, protocols, and procedures necessary to provide such mapping.
Universal Personal Telecommunications (UPT): telecommunications service which enables uninterrupted access to
telecommunications services while allowing personal mobility
UPT Number (UPTN): which uniquely and unambiguously identifies each UPT user
NOTE: It is used by a calling party to reach the UPT user. This number is independent of terminal, network or
service used and shall conform to ITU-T Recommendation E.168 [2]. A UPT user may have more than
one UPT number (for example, a business UPT number for business calls and a private UPT number for
private calls), see ITU-T Recommendation E.168 [2].
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
AD Administrative Domain
AD-BES Administrative Domain Back-End Service
ARDB Administrative Reference DataBase
HNN Home Network Name
IP Internet Protocol
ITU-T International Telecommunication Union - Telecommunications standardization sector
NAA Number Allocation Authority
PIN Personal Identification Number
PSTN Public Switched Telephone Network
RTDB Real-Time DataBase
SCN Switched Circuit Network
SCP Service Control Point
ETSI
7 ETSI TR 101 886 V1.1.1 (2002-02)
SOA Service Order Activation
TRC TIPHON Resolution Capability
UPT Universal Personal Telecommunications
UPTN UPT Number
4 Overview
The main purpose of the TIPHON Resolution Capability (TRC) is to provide a global, geographically independent
service to telephony users in TIPHON compliant networks. Each user obtains a unique E.164 number during the
provisioning process either from a Number Allocation Authority (NAA) or via the service provider where he/she first
subscribes to the service. This globally unique E.164 number unambiguously identifies the subscriber. TRC enables
personal mobility in that numbers are assigned to individuals and not to terminals; and they belong to individuals, not
service providers. Hence, subscribers using TRC may change their service providers while keeping their E.164
numbers.
TRC is designed to operate within a resolution domain defined by the following characteristics:
• there is a group of service providers that agree to interconnect their networks together to provide cross-service
provider telephony services to their subscribers. Each service provider constitutes an administrative domain, and is
identified by one or more unique names called HNNs;
• each provider may have multiple networks and these networks may be heterogeneous, such as PSTN, wireless and
IP networks. But all participating networks shall be TIPHON compliant;
• there is a specific E.164 numbering range/type that the group agrees to use for the intended telephony services. The
numbering range/type is distributed among the service providers (this can be either in blocks of numbers or number
by number like in International UPT). At any instant, an active E.164 number is served by exactly one service
provider, called the home service provider of the subscriber. However, the association of an E.164 number and its
home service provider cannot be derived directly from the number itself without querying the TRC.
A TRC is defined with respect to a resolution domain, which in turn is defined by the group of service providers and the
E.164 numbering range/type for a specific telephony service. There is exactly one TRC for each resolution domain. In
the case where the same group of service providers use different E.164 numbering ranges/types for different telephony
services, they are considered as different resolution domains, and thus the corresponding TRCs are functionally
different even though in some implementations they may be packaged together in one physical network element.
Unless otherwise stated explicitly, the present document only concerns requirements of TRC with respect to a single
resolution domain. Requirements for services involving multiple TRCs are out of scope of the present document, but
may be a subject for further study.
An example of a resolution domain is depicted by figure 1. For a given resolution domain, TRC serves as a centralized
number resolution clearinghouse among all service providers for inter-domain call routing. Its main function is to map
an E.164 number to the HNN of the home service provider of that number. However, since an HNN includes the
identifier for a service provider, for call routing purposes another resolution function (routing resolution) may be needed
to map the HNN to the network addresses of the service provider network. This is accomplished by the Administrative
Domain-Back End System (AD-BES) of a service provider, which is outside the scope of TRC.
ETSI
8 ETSI TR 101 886 V1.1.1 (2002-02)

TRC
AD-BES
AD-BES
Service Provider C
Service Provider A
AD-BES
Service Provider B
Resolution Domain
Figure 1: Resolution domain and TIPHON Resolution Capability (TRC)
Inter-provider call routing within a resolution domain follows the hop-by-hop paradigm using the two-level resolution
hierarchy. The top-level resolution, called service resolution, is accomplished by querying the TRC, which returns the
HNN of the home service provider of the called E.164 number. This is normally done once by the originating service
provider since the HNN is passed
...