ETSI TS 185 003 V2.0.0 (2008-03)

ETSI TS 185 003 V2.0.0 (2008-03)
Technical Specification


Telecommunications and Internet converged Services and
Protocols for Advanced Networking (TISPAN);
Customer Network Gateway (CNG)
Architecture and Reference Points

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2 ETSI TS 185 003 V2.0.0 (2008-03)



Reference
DTS/TISPAN-05012-NGN-R2
Keywords
architecture, gateway, IMS, interface, network
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3 ETSI TS 185 003 V2.0.0 (2008-03)
Contents
Intellectual Property Rights.5
Foreword.5
Introduction .5
1 Scope.6
2 References.6
2.1 Normative references.6
2.2 Informative references.7
3 Definitions, symbols and abbreviations .7
3.1 Definitions.7
3.2 Abbreviations.8
4 The CNG Architecture .9
4.1 Introduction .9
4.2 CPN and NGN side requirements.9
4.2.1 Analog phone connected to the NGN through a CNG.9
4.2.2 IMS Customer Network Device connected to the NGN through a CNG.10
4.2.3 SIP-non IMS Customer Network Device connected to the NGN through a CNG .11
4.3 CNG functions.12
4.3.1 The transfer level functions .12
4.3.1.1 CNG-NFF: CNG-NAPT and Firewall Function .12
4.3.2 The transport level functions .13
4.3.2.1 CNG-CSMF: CNG-Communication Services Media Function .13
4.3.2.2 CNG-IPTVF: CNG-IPTV Function.13
4.3.3 The CNG Network Attachment Subsystem entities (CNG-NASS) .13
4.3.3.1 CNG-CMF: CNG-Configuration and Management Function.13
4.3.3.2 CNG-AtF: CNG-Attachment Function.13
4.3.3.3 CNG-PCF: CNG-Policy Control Function.13
4.3.3.4 CNG-AuF: CNG-Authentification Function.14
4.3.3.5 CNG-LF: CNG-Location Function.14
4.3.4 The CNG-Resource and Admission Control Functional entities (C-RACF) .14
4.3.4.1 CNG-ACF: CNG-Admission Control Function.14
4.3.5 The CNG-Service-related Functional entities (CNG-SF) .14
4.3.5.1 VGCF: Voice Gateway Control Function .14
4.3.5.2 CNG-SIP Proxy B2BUA Function .15
4.3.5.3 CNG-PPF: CNG-Plug and Play Function .15
4.3.5.4 CNG-UIF: CNG-User Interface Function.15
4.3.5.5 ISIM module.16
5 The CNG Reference points .16
5.1 CND side Reference points .16
5.1.1 Network attachment reference points .16
'
5.1.1.1 e reference point .16
1
'
5.1.1.2 e reference point .17
3
5.1.1.3 a reference point.17
u
5.1.2 Transport level reference points.17
5.1.2.1 D reference point .17
j
5.1.3 Service-related reference points.17
'
5.1.3.1 G reference point .17
m
5.1.3.2 u reference point.18
5.1.3.3 C reference point.18
5.2 NGN side Reference points.18
5.2.1 Network attachment reference points .18
5.2.1.1 e reference point.18
1
5.2.1.2 e reference point.18
3
5.2.2 Service-related reference points.19
ETSI

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4 ETSI TS 185 003 V2.0.0 (2008-03)
5.2.2.1 G reference point.19
m
5.2.2.2 U reference point .19
t

6 The CNG Data Model .19
7 Information flows.19
7.1 Attachment flows .20
7.2 Configuration and management flows.20
7.3 Signalling flows.21
7.3.1 CND attachment and local/IMS registration.21
7.3.2 Outgoing call.22
7.3.2.1 SIP non-IMS CND.22
7.3.2.2 IMS CND.23
7.3.3 Internal call .24
7.3.4 Admission Control.24
7.4 Remote Access flows .25
7.4.1 Remote Access Connection Set-up.25
7.4.2 Download of content using HTTP .26
7.4.3 Upload of content using HTTP.28
Annex A (informative): Bibliography.30
History .31

ETSI

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5 ETSI TS 185 003 V2.0.0 (2008-03)
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 Specification (TS) has been produced by ETSI Technical Committee Telecommunications and Internet
converged Services and Protocols for Advanced Networking (TISPAN).
Introduction
The present document defines Release 2 of an anticipated series of releases of TISPAN NGN. Release 2 extends the
capabilities of Release 1, enhances some Release 1 capabilities and provides some new services. The TISPAN NGN is
described in terms of the content capabilities and this release (Release 2) is defined by the documentation set and the
features that these support.
Clause 4 provides a general description of an NGN, and the TISPAN Release 1 NGN in particular. The general
objective of Release 2 is to extend Release 1 through enhancements and new services. The present document focuses on
additional capabilities and services and continues to enable an NGN to be a flexible platform allowing future
enhancements and releases.
The TISPAN NGN is specified using a release mechanism. The present document provides an overview of the
capabilities in the second release. No assumptions should be made about future releases.
Throughout the present document, references to NGN are assumed to be references to TISPAN NGN unless otherwise
indicated.
ETSI

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6 ETSI TS 185 003 V2.0.0 (2008-03)
1 Scope
The present document provides an overview of Customer Network Gateway (CNG) functional architecture and
reference points and the way it interacts with an NGN, as described in ETSI TISPAN Release 1 and Release 2 standards
(see ES 282 001 [1]).
The present document describes architectural building blocks to be included in the CNG to support the interworking
with an NGN, both at the transfer, transport and service layers. It also defines the reference points between the CNG
internal architectural blocks involved and a CND.
The WG5 does not address the layer 1 issues, as such studies refer to the AT&TM Group.
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• Non-specific reference may be made only to a complete document or a part thereof and only in the following
cases:
- if it is accepted that it will be possible to use all future changes of the referenced document for the
purposes of the referring document;
- for informative references.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
For online referenced documents, information sufficient to identify and locate the source shall be provided. Preferably,
the primary source of the referenced document should be cited, in order to ensure traceability. Furthermore, the
reference should, as far as possible, remain valid for the expected life of the document. The reference shall include the
method of access to the referenced document and the full network address, with the same punctuation and use of upper
case and lower case letters.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
2.1 Normative references
The following referenced documents are indispensable for the application of the present document. For dated
references, only the edition cited applies. For non-specific references, the latest edition of the referenced document
(including any amendments) applies.
[1] ETSI ES 282 001: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); NGN Functional Architecture".
[2] ETSI ES 282 003: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); Resource and Admission Control Sub-system (RACS);
Functional Architecture".
[3] ETSI ES 282 004: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); NGN Functional Architecture; Network Attachment
Sub-System (NASS)".
[4] ETSI ES 282 007: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); IP Multimedia Subsystem (IMS); Functional architecture".
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7 ETSI TS 185 003 V2.0.0 (2008-03)
[5] ETSI ES 283 003: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); IP Multimedia Call Control Protocol based on Session
Initiation Protocol (SIP) and Session Description Protocol (SDP) Stage 3 [3GPP TS 24.229
(Release 7), modified]".
[6] ETSI TS 182 012: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); IMS-based PSTN/ISDN Emulation Subsystem; Functional
architecture".
[7] ETSI TS 183 019: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); Network Attachment; User-Network Interface Protocol
Definitions".
[8] IETF RFC 3261: "SIP: Session Initiation Protocol".
[9] IETF NAPT traversal Working Groups: BEHAVE for STUN TURN methods, MMUSIC for ICE,
SIP for SIP Outbound.
[10] ETSI TS 131 103: "Digital cellular telecommunications system (Phase 2+); Universal Mobile
Telecommunications System (UMTS); Characteristics of the IP Multimedia Services Identity
Module (ISIM) application (3GPP TS 31.103)".
[11] IETF RFC 2131: "Dynamic Host Configuration Protocol".
[12] ETSI TS 124 229: "Digital cellular telecommunications system (Phase 2+); Universal Mobile
Telecommunications System (UMTS); Internet Protocol (IP) multimedia call control protocol
based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3
(3GPP TS 24.229 version 8.2.0 Release 8)".
[13] ETSI TS 185 006: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); TISPAN Customer Devices architecture and interfaces".
2.2 Informative references
[14] ETSI TR 185 007: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); Analysis of protocols for customer networks connected to
TISPAN NGN".
[15] ETSI TR 185 004: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); High level customer network architectures".
[16] HGI Forum TR-069: "CPE WAN Management Protocol".
[17] HGI Forum TR-098: "Data Model for TR6069".
[18] HGI Forum TR-104: "Provisioning Parameters for VoIP CPE".
[19] ETSI TS 185 005: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); Services requirements and capabilities for customer networks
connected to TISPAN NGN".
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
CPN Device: device that is physically installed in the CPN allowing user access to network services; this can be a
Customer Network Gateway with gateway functionalities towards the NGN, or a Customer Network Device being the
end user terminal
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8 ETSI TS 185 003 V2.0.0 (2008-03)
Customer Network Device (CND): CPN device enabling the final user to have direct access to services through a
specific user interface
NOTE: CNDs can be dedicated to the internet, conversational and audio-video services. But they could be also
Consumer Electronics equipment and other devices which may have nothing to do with these premium
services (e.g. services performing a content sharing within a CPN, typically between a PC and a music
system).
Customer Network Gateway (CNG): CPN device acting as a gateway between the CPN and the NGN
NOTE: CNG is able to perform networking functions from physical connection to bridging and routing
capabilities (L1-L3), but also possibly implementing functions related to the service support (up to L7).
Customer Premises Network (CPN): in-house network composed by customer network gateway, customer network
devices, network segments, network adapters and nodes
NOTE: Network segments are physical wired or wireless connections between customer premises network
elements); network adapters are elements performing a L1/L2 conversion between different network
segments; nodes are network adapters with L3 routing capabilities.
IMS CND: CND whose external behavior complies with the IMS specifications
NOTE: See [1], [2], [3], [4] and [5].
"Multiple" Play Services (can be: double, triple, quadruple etc.): delivery by a single service provider of different
types of concurrent services to one or multiple users within the same CPN
NOTE: Services can be categorised in the following way: data (e.g. Web browsing, best effort traffic etc.),
person(s) to person(s) communication, entertainment.
Non-IMS SIP IETF CND: SIP-based CND whose external behavior conforms to RFC 3261 [8] but do not fully
conform to the IMS specifications
Many scenarios are expected to provide one service from a service provider to a customer device (case of multiple
service providers, one or several CNG, etc.). They are presented within the TR 185 004 [15] and TS 185 005 [19].
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ACS Auto-Configuration Server
AKA Authentication and Key Agreement
ALG Application Layer Gateway
A-MGF Access-Media Gateway Function
ARF Access Relay Function
B2BUA Back-to-Back User Agent
CLF Connectivity session Location and repository Function
CND Customer Network Device
CNG Customer Network Gateway
CNG-ACF CNG-Admission Control Function
CNG-AtF CNG-Attachment Function
CNG-AuF CNG-Authentication Function
CNGCF CNG Configuration Function
CNG-CMF CNG-Configuration and Maintenance Function
CNG-CSMF CNG- Communication Services Media Function
CNG-LF CNG-Location Function
CNG-NFF CNG-NAPT and Firewall Function
CNG-PCF CNG-Policy Control Function
CNG-PPF CNG-Plug and Play Function
CNG-UIF CNG-User Reference point Function
CPN Customer Premises Network
ETSI

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9 ETSI TS 185 003 V2.0.0 (2008-03)
DHCP Dynamic Host Configuration Protocol
NOTE: http://www.ietf.org/rfc/rfc3235.txt?number=2131
EF Elementary Files
ETH Ethernet
IMS IP Multimedia Subsystem
ISIM IMS Subscriber Identity Module
ISIM IMS Subscriber Identity Module
MGC Media Gateway Controller
NACF Network Access Configuration Function
NAPT Network Address and Port Translation
NOTE: http://www.ietf.org/rfc/rfc3235.txt?number=3235

NASS Network Attachment Subsystem
P-CSCF Proxy Call Session Control Function
PLT Power-Line Telecommunication
SIP Session Initiation Protocol
SSID Service Set Identifier
UE User Equipment
UICC Universal Integrated Circuit Card
VGCF Voice Gateway Control Function
4 The CNG Architecture
4.1 Introduction
The following clauses present the functional entities for the CNG. Examples of Customer Network Devices may be
connected to the CNG:
a) Analog phones connected through the CNG to the NGN network.
b) IMS Customer Network Devices connected through a CNG to the NGN network [5].
c) Non IMS SIP IETF Customer Network Devices [7].
d) ISDN Customer Network Devices through the CNG to the NGN network.
Different types of Customer Network Devices may be involved in Intra CPN communication through a CNG.
The list of Customer Network Devices which are likely to be connected to the CNG is provided by the TS 185 006 [13].
The general overview of the CPN Architecture is provided by the TR 185 004 [15]. The CNG functional entities are
described in the following parts of the document, as well as the reference points between each function.
4.2 CPN and NGN side requirements
The list of the CNG requirements is provided by the TS 185 005. specification for Service requirements and capabilities
for customer networks connected to TISPAN NGN.
4.2.1 Analog phone connected to the NGN through a CNG
In this case, the CNG includes all the CPN functionalities necessary to fulfill a service between the analog phone and
the NGN, as shown in figure 1.
ETSI

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10 ETSI TS 185 003 V2.0.0 (2008-03)


TThhee C CPPN N EEnnvviiroronnmmeenntt tthhee NNGGN anN andd I IMMS enS enttiittiieess
CCuustostommeerr N Neetwtwoorrkk GaGatetewwaayy
CNGCNG
UU
tt ASAS
ZZ
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AAcceccessss n nooddee
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ee
33
CCNNGG--PPoolliiccyy Co Connttroroll Fu Funnccttiioonn (C(CNGNG-P-PCF)CF)
CNCNGGCCFF
CCNNGG--CCoonnffiigurguratiation & Manon & Manaaggeemmeent Fnt Fuunncctitionon ((CCNNGG--CCMMFF))
ee
ARARFF
11
CCNNGG--LoLoccaattiioonn F Funcuncttiioonn ((CCNNGG--LLFF))
CNCNGG--AAttttaacchhmemenntt FFuunnccttiioonn ((CNGCNG--AAttFF))

   Exchanges inside the CNG

       Network attachment functions

       Transport plane functions

       Service plane and applicative functions

Figure 1: Analog phone connected to the NGN-IMS network through a CNG
4.2.2 IMS Customer Network Device connected to the NGN through a
CNG
In this case, the Customer Network Device includes all the CPN functionalities necessary to fulfill a service between
itself and the NGN-IMS network, as shown in figure 2.
ETSI

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11 ETSI TS 185 003 V2.0.0 (2008-03)


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ththee U Usserer EqEquuiippmmenentt thethe NG NGN N aannd Id IMMSS
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mm mm
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CCNNDD--SSeellff P Prrovoviissiionioningng ((CCNNDD--SSP)P) ASAS
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CCNNGG--NNAAPPTT and F and Fiirreewwaallll F Fuuncnctitioonn ((CCNNGG--NNFFFF))
FFuncunctitionon ((CCNNDD--CCSSMMFF))
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DjDj
UIUICCCC CCNNGG--IIPPTTVV F Fuunnccttiioonnss (C(CNGNG-I-IPPTTVVFF) )
CCNNDD--CCoonfinfigguurraattiioonn & & ManManageagemmentent AAcccecessss n nooddee
FFuncunctitionon ((CCNNDD--CCMMFF))
ISISIIMM
ee
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ee ''
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CCNNDD--LoLoccaall A Auutthhenenttiiccaatitioonn FFuuncncttiioonn ((CCNNDD--LLAFAF))
CNCNGG--PPoolliiccyy Co Connttroroll FuFunnccttiioonn (C(CNGNG-P-PCCFF))
ee
33
CNDCND--AAttttaacchhmmeenntt FFuunnccttioionn ((CNCND-AD-AttF)F) CNCNGGCCFF
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ee
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e
...