Content for  TS 24.523  Word version:  16.0.0

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1  ScopeWord‑p. 6
The present document provides the possible scenarios for:
  • the interconnection of an Next Generation Corporate Network (NGCN) with a Next Generation
    Network (NGN); and
  • the support of NGCN capabilities within an NGN, either towards a User Equipment (UE) or to an NGCN.
Unless otherwise specified by reference to other documents, all requirements relating to architecture and functional requirements are contained within the present document.

2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
TS 23.167: "Technical Specification Group Services and System Aspects; IP Multimedia Subsystem (IMS) emergency sessions".
TS 22.519: "Technical Specification Group Services and System Aspects; Business Communication Requirements".
ETSI ES 282 001 (V.3.4.1): "Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); NGN Functional Architecture".
TS 24.524: "Technical Specification Group Core Network and Terminals; Hosted Enterprise Services; Architecture, functional description and signalling".
TS 24.525: "Technical Specification Group Core Network and Terminals; Business trunking; Architecture and functional description".
TS 29.162: "Technical Specification Group Core Network and Terminals; Interworking between IM CN subsystem and IP networks".
TS 33.203: "Technical Specification Group Services and System Aspects; 3G Security; Access security for IP-based services".
ETSI TR 102 478 (V1.1.1): "Enterprise Communication in Next Generation Corporate Networks (NGCN) involving Public Next Generation Networks (NGN)" (also published as ECMA TR/91).
RFC 5863  (April 2010): "Requirements from Session Initiation Protocol (SIP) Session Border Control (SBC) Deployments".
TS 33.210: "Technical Specification Group Services and System Aspects; 3G security; Network Domain Security (NDS); IP network layer security".
TS 23.218: "Technical Specification Group Core Network and Terminals; IP Multimedia (IM) session handling; IM call model; Stage 2".

3  Definitions, symbols and abbreviationsWord‑p. 7

3.1  Definitions

For the purpose of the present document, the terms and definitions given in TS 22.519 apply:
business trunking
business trunking application
Corporate telecommunication Network (CN)
Hosted Enterprise Services (HES)
Next Generation CN (NGCN)
NGCN site
PNP number
private network traffic
Private Numbering Plan (PNP)
public network traffic

3.2  Abbreviations

For the purposes of the present document, the following abbreviations apply:
Application Programming Interface
Application Server
Application Service Provider
Breakout Gateway Control Function
Core Netwrok
Customer Network Device
Customer Network Gateway
Dynamic Host Configuration Protocol
Fully Qualified Domain Name
Hosted Enterprise Services
Home Subscriber Server
Interconnection Border Control Function
Interrogating CSCF
IP Multimedia
IP Multimedia Core Network
IP Multimedia Subsystem
Inter Operator Identifier
Internet Protocol
InterWorking Function
Multiple Association Control Function
Network Attachment SubSystem
Network Address Translator
Next Generation Corporate Network
Next Generation Network
Proxy CSCF
Private Numbering Plan
Public Safety Answering Point
Resource and Admission Control Subsystem
Serving CSCF
Session Initiation Protocol
Session Service Provider
Terminal Equipment
Transport Service Provider
User Equipment
Uniform Resource Identifier

4  IntroductionWord‑p. 8

4.1  General modelling and relationship to NGN releases

A number of different scenarios will likely exist for enabling interactions between Next-Generation Corporate Networks (NGCN) and Next Generation (public) Networks (NGN). The present document describes a sub-set of these scenarios and the architectural and functional requirements that arise from the support of these scenarios. Future releases may document other scenarios as requirements emerge.

4.2  Levels of service provision

The development of different interaction scenarios based upon the distribution of the hosting of private network capabilities in the enterprise operator and/or in the public NGN operator leads to the concept of the public NGN operator being able to offer services to NGCNs and the NGCN users at a number of different levels. This concept is further described in ETSI TR 102 478 [8].
The most basic level of service provision is IP connectivity. Differentiation from the Internet can be in the form of improved or guaranteed quality of service or security. For the purposes of the present document an NGN that provides this level of service acts as a Transport Service Provider (TSP).
A second level of service provision is in session establishment and control of communication sessions, e.g. voice, multimedia, messaging. Here the NGN adds value by being involved in the signalling protocol used to establish and control media sessions. For the purposes of the present document the primary session control signalling protocol concerned is assumed to be the Session Initiation Protocol (SIP). Added value can include intelligent routing, provision of quality of service for media, provision of gateway services to legacy networks, assistance in NAT traversal, etc. For the purposes of the present document an NGN that provides this level of service is known as a Session Service Provider (SSP).
A third level of service provision is at the application level. Applications can be many and varied, but for the purposes of the present document an application is assumed to be applied on top of session level services. An application may be able to monitor or control multi-media sessions (either directly or through a protocol or API) and may or may not be involved in media as well. Examples of applications that involve media include conferencing services, transcoding and translation services and call distribution centres. Examples of applications that monitor or control sessions but do not involve media include presence services, call logging services and UA configuration services. In addition, an application may be accessed through a session control protocol such as SIP. For the purposes of the present document an NGN that provides this level of service is known as an Application Service Provider (ASP).
At the application level, the additional services can be provided by the home network operator, or can be provided by a third party service provider. It is also possible that the enterprise itself provides the services, by providing equipment that acts as an application server beyond an ISC gateway function.
An NGN may provide services at one or more of these levels. Not all services offered will be of interest to enterprise customers and of relevance for interworking with NGCNs. Enterprise customers may use different NGNs for different levels of service provision and may have different contractual relationships with each of these NGNs. In addition, for a given communication and depending on the number of parties to be interconnected and/or the number of services to be accessed, multiple providers may be involved.
The scenarios provided in the present document are presented in accordance with this concept.

4.3  Introduction to the scenarios covered by the present documentWord‑p. 9
The present document has been structured following the service level categories as introduced in subclause 4.2 in mind, as follows:
  • clause 6 presents scenarios that relate to provision of IP connectivity level services offered by an NGN;
  • clause 7 presents scenarios that relate to provision of session establishment and control of communication session services offered by an NGN;
  • clause 8 presents scenarios that relate to provision of application level services offered by an NGN; and
  • clause 9 presents scenarios that relate to provision of session level roaming services offered by an NGN.
The scenarios presented in clause 6 are IP level virtual leased line services between NGCN sites or between an NGCN site and a remote NGCN UE.
The scenario presented in clause 7 is a session level virtual leased line.
The application level service scenarios presented in clause 8 are hosted enterprise services (HES), subscription based business trunking and peering based business trunking.
Clause 9 presents a special class of session level service scenarios that are so distinct from other session level services that they are a service class of their own. Roaming scenario covered in this release is the ability for an NGCN user to be able to roam into an NGN with which the NGCN has a roaming agreement. Other scenarios are listed for completeness, however these scenarios are not in the scope of the current release or are already covered as part of normal roaming procedures.

5  General requirements

No additional general requirements are identified in the present document for this release.

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