1、 Reference number ISO/IEC TR 12860:2009(E) ISO/IEC 2009TECHNICAL REPORT ISO/IEC TR 12860 First edition 2009-04-15Information technology Telecommunications and information exchange between systems Next Generation Corporate Networks (NGCN) General Technologies de linformation Tlcommunications et chang
2、e dinformation entre systmes Rseaux dentreprise de prochaine gnration (NGCN) Gnralits ISO/IEC TR 12860:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces whic
3、h are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Inc
4、orporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event t
5、hat a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2009 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mec
6、hanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.i
7、so.org Published in Switzerland ii ISO/IEC 2009 All rights reservedISO/IEC TR 12860:2009(E) ISO/IEC 2009 All rights reserved iii Contents Page Foreword. v Introduction . vi 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 2 4 Abbreviated terms 4 5 Background . 5 6 General concepts 6 6
8、.1 Basic communication architecture. 6 6.2 Session level architecture . 8 6.2.1 Signalling using SIP . 8 6.2.2 Media path . 10 6.2.3 Example . 10 6.3 Domains. 10 6.4 Mobility 11 6.4.1 Roaming of enterprise users outside their home domain 12 6.4.2 Accommodating guest users on an NGCN 13 6.5 The hosti
9、ng concept. 13 6.5.1 Dedicated NGCN . 14 6.5.2 Enterprise hosted by a single public network infrastructure. 15 6.5.3 Enterprise hosted by multiple public network infrastructures 15 6.5.4 Enterprise hosted by a combination of enterprise infrastructure and a public network infrastructure. 16 6.6 Priva
10、te network traffic and public network traffic . 16 6.7 Other technical considerations . 17 7 Scenarios for session-based communications . 17 7.1 Session-based intra-domain communications 18 7.2 Session-based inter-domain communications within a single enterprise network 19 7.2.1 Communication betwee
11、n domains supported by the same infrastructure 20 7.2.2 Communications between domains of an NGCN via a TSP. 21 7.2.3 Communications between domains of an NGCN using private network traffic through a hosting NGN 21 7.2.4 Communications between domains of an NGCN using public network traffic through
12、a public SSP such as an NGN 22 7.2.5 Communications between a dedicated NGCN domain and a domain hosted by an NGN 22 7.2.6 Communications between a dedicated NGCN domain and a domain hosted by an NGN as private network traffic via an intermediate NGN domain 22 7.3 Session-based communication between
13、 two enterprises . 23 7.3.1 Extension of enterprise network to include partner networks 23 7.3.2 Direct peering 23 7.3.3 Indirect peering . 24 7.3.4 Third party assistance 25 7.3.5 Direct peering between two enterprises hosted by the same hosting enterprise infrastructure. 26 7.4 Session-based commu
14、nication with users of public networks. 26 7.4.1 Communication between an NGCN user and an NGN public network user. 26 7.4.2 Communication between an NGCN user and an NGN public network user with break-in or break-out function in the NGN. 27 ISO/IEC TR 12860:2009(E) iv ISO/IEC 2009 All rights reserv
15、ed7.4.3 Communication between an NGCN user and a public network user of a remote NGN. 28 7.4.4 Communication between an NGCN user and a public network user of a remote NGN with break-in or break-out function in the local NGN 28 7.4.5 Communication between an NGCN user and a public network user of a
16、remote NGN with break-in or break-out function in the remote NGN 28 7.4.6 Communication between an NGCN user and a PSTN/ISDN user via an NGN 29 7.4.7 Communication between an enterprise user hosted by a public network infrastructure and a public network user of that same infrastructure. 30 7.5 Sessi
17、on-based roaming 30 7.5.1 An NGCN user at a visited sub-domain of the NGCN . 30 7.5.2 An NGCN user at a visited sub-domain of the NGCN using private network traffic through an NGN . 31 7.5.3 An NGCN user at a visited NGN. 31 7.5.4 An NGCN user at a visited NGN using indirect roaming 31 7.5.5 An NGN-
18、hosted enterprise user at a visited NGN 32 7.5.6 An NGN-hosted enterprise user at a visited NGCN. 32 8 NGN considerations 32 8.1 Summary of scenarios involving NGN32 8.1.1 Scenarios involving NGN as a TSP . 32 8.1.2 Scenarios involving NGN as a SSP. 33 8.1.3 Roaming scenarios involving NGN as a SSP.
19、 33 8.2 Interfacing NGCN to NGN. 33 8.2.1 Subscription-based business trunking 33 8.2.2 Peering-based business trunking . 34 8.2.3 Roaming. 34 9 Application considerations 34 10 Current standards and standardisation efforts . 36 10.1 IETF Real-time Applications and Infrastructure (RAI) area 36 10.2
20、SIP Forum 36 10.3 ETSI TISPAN 36 10.4 3GPP. 37 10.5 ITU-T Study Group 13 . 37 ISO/IEC TR 12860:2009(E) ISO/IEC 2009 All rights reserved v Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwid
21、e standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fi
22、elds of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. International Standards are drafted
23、 in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of the joint technical committee is to prepare International Standards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an Internat
24、ional Standard requires approval by at least 75 % of the national bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. ISO/
25、IEC TR 12860 was prepared by Ecma International (as ECMA TR/95) and was adopted, under a special “fast-track procedure”, by Joint Technical Committee ISO/IEC JTC 1, Information technology, in parallel with its approval by national bodies of ISO and IEC. ISO/IEC TR 12860:2009(E) vi ISO/IEC 2009 All r
26、ights reservedIntroduction This Technical Report is the first of a series of publications that explore IP-based enterprise communication involving Corporate telecommunication Networks (CNs) (also known as enterprise networks) and in particular Next Generation Corporate Networks (NGCN). The series pa
27、rticularly focuses on inter-domain communication, including communication between parts of the same enterprise, between enterprises and between enterprises and carriers. This particular Technical Report provides general information on the subject, defines some architectural concepts, identifies vari
28、ous communication scenarios, and provides a framework in support of other publications that provide greater detail on particular topics. This Technical Report is based upon the practical experience of Ecma member companies and the results of their active and continuous participation in the work of I
29、SO/IEC JTC 1, ITU-T, ETSI, IETF and other international and national standardization bodies. It represents a pragmatic and widely based consensus. In particular, Ecma acknowledges valuable input from experts in ETSI TISPAN. TECHNICAL REPORT ISO/IEC TR 12860:2009(E) ISO/IEC 2009 All rights reserved 1
30、 Information technology Telecommunications and information exchange between systems Next Generation Corporate Networks (NGCN) General 1 Scope This Technical Report is part of a series of publications that provides an overview of IP-based enterprise communication involving Corporate telecommunication
31、 Networks (CNs) (also known as enterprise networks) and in particular Next Generation Corporate Networks (NGCN). The series particularly focuses on session level communication based on the Session Initiation Protocol (SIP) 6, with an emphasis on inter-domain communication. This includes communicatio
32、n between parts of the same enterprise (on dedicated infrastructures and/or hosted), between enterprises and between enterprises and public networks. Key technical issues are investigated, current standardisation work and gaps in this area are identified and a number of requirements are stated. This
33、 particular Technical Report provides general information on the subject, defines some architectural concepts, identifies various communication scenarios, and provides a framework in support of other publications that provide greater detail on particular topics. At the time of publication of this Te
34、chnical Report, one further document in the series has been published, on the subject of identification and routing 3. The scope of this Technical Report is limited to communications with a real-time element, including voice, video, real-time text and instant messaging. Further details on mobility i
35、n an NGCN environment are to be found in ISO/IEC TR 26927 2. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (
36、including any amendments) applies. 1 ISO/IEC 18051:2007, Information technology Telecommunications and information exchange between systems Services for Computer Supported Telecommunications Applications (CSTA) Phase III 2 ISO/IEC TR 26927:2006, Information technology Telecommunications and informat
37、ion exchange between systems Corporate Telecommunication Networks Mobility for Enterprise Communications 3 ISO/IEC TR 12861:2009, Information technology Telecommunications and information exchange between systems Next Generation Corporate Networks (NGCN) Identification and routing 4 ITU-T Recommenda
38、tion H.248, Gateway control protocol 5 ITU-T Recommendation H.323, Packet-based multimedia communications systems 6 IETF RFC 3261, SIP: Session Initiation Protocol 7 IETF RFC 3550, RTP: A Transport Protocol for Real-Time Applications ISO/IEC TR 12860:2009(E) 2 ISO/IEC 2009 All rights reserved8 IETF
39、RFC 4566, SDP: Session Description Protocol 9 SIP Forum sf-adopted-twg-IP_PBX_SP_Interop-sibley-sipconnect “IP-PBX / Service Provider Interoperability - SIPConnect 1.0 Technical Recommendation” 10 ETSI EG 201 017, Corporate Telecommunication Networks (CN); Standardization plan 11 ETSI TR 180 000, Te
40、lecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); NGN Terminology 12 IEEE 802.1x, Port Based Network Access Control 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 Corporate telecommunication Net
41、work (CN) (ETSI EG 201 017 10) Telecommunication network serving a corporation, i.e. a single organization, an extended enterprise, or an industry application group as defined by the International Chamber of Commerce (ICC). NOTE Sets of equipment Customer Premises Equipment (CPE) and/or Customer Pre
42、mises Networks (CPN) are typically located at geographically dispersed locations and are interconnected to provide networking services to a defined group of users. A CN can employ connection-oriented and connectionless technology. 3.2 Domain Session level capabilities within a single administrative
43、area. NOTE A domain may or may not correspond to a DNS domain. 3.3 Enterprise network A CN comprising session level capabilities and optionally application layer capabilities hosted on one or more infrastructures. NOTE Infrastructures can include the enterprises own infrastructure (dedicated NGCN),
44、the infrastructure of one or more hosting NGNs, the infrastructure of one or more hosting NGCNs or any combination of these. 3.4 Home server For a given user, as identified by a SIP address of record, the SIP intermediary that contains registrar and proxy functionality in support of that user. NOTE
45、It is therefore the SIP intermediary with which the users UAs register. 3.5 Transport service provider (TSP) A business or organisation separate from an enterprise that provides services for transporting data based on the use of IP at the network layer, thereby allowing the enterprise to communicate
46、 with entities outside the enterprise or with geographically dispersed parts of the enterprise. NOTE 1 Communication can but need not be via the public Internet. NOTE 2 A TSP should not intervene above the transport layer. This does not preclude a business or organisation that acts as a TSP also act
47、ing as the provider of higher level services, e.g., as an SSP. ISO/IEC TR 12860:2009(E) ISO/IEC 2009 All rights reserved 3 3.6 Medium A given type of payload transported between session users (e.g., audio, video, text), separate from any signalling used for session establishment. 3.7 Next Generation
48、 CN (NGCN) That part of an enterprise network that is not based on public network infrastructure, that is designed to take advantage of emerging IP-based communications solutions and that can have its own applications and service provisioning. NOTE An NGCN can be an entire enterprise network if none
49、 of that network is based on public network infrastructure. 3.8 Next Generation Network (NGN) The definition in ETSI TR 180 000 applies. NOTE This defines an NGN as follows: “A Next Generation Network is a packet-based network able to provide services including Telecommunication Services and able to make use of multiple broadband, QoS-enabled transport technologies and in which service-related functions are independent from underlying transport-related technologies. It of
