ISO IEC 17343-2007 Information technology - Telecommunications and information exchange between systems - Corporate telecommunication networks - Signalling inte.pdf

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1、 Reference number ISO/IEC 17343:2007(E) ISO/IEC 2007INTERNATIONAL STANDARD ISO/IEC 17343 Second edition 2007-11-15 Information technology Telecommunications and information exchange between systems Corporate telecommunication networks Signalling interworking between QSIG and SIP Basic services Techn

2、ologies de linformation Tlcommunications et change dinformation entre systmes Rseaux de tlcommunications dentreprise Signalisation dinterfonctionnement entre QSIG et SIP Services de base ISO/IEC 17343:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes lice

3、nsing policy, this file may be printed or viewed but shall not be edited unless the typefaces which 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 IS

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5、en taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2007 All rights reserved. Unless otherwise specified, no par

6、t of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, 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 5

7、6 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO/IEC 2007 All rights reservedISO/IEC 17343:2007(E) ISO/IEC 2007 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope 1 2 Conformance2 3 Normativ

8、e references 2 4 Terms and definitions .3 5 Abbreviated terms .3 6 Background and Architecture 4 7 General Requirements 6 8 Message Mapping Requirements.7 8.1 Message Validation and Handling of Protocol Errors7 8.2 Call Establishment from QSIG to SIP 8 8.3 Call Establishment from SIP to QSIG 12 8.4

9、Call Clearing and Call Failure .16 8.5 Request to Change Media Characteristics19 9 Number Mapping19 9.1 Mapping from QSIG to SIP20 9.2 Mapping from SIP to QSIG21 10 Requirements for Support of Basic Services .23 10.1 Derivation of QSIG Bearer Capability Information Element 23 10.2 Derivation of Medi

10、a Type in SDP23 11 Security Considerations .24 11.1 General24 11.2 Calls from QSIG to Invalid or Restricted Numbers 24 11.3 Abuse of SIP Response Code 24 11.4 Use of the To Header URI24 11.5 Use of the From Header URI .25 11.6 Abuse of Early Media 25 11.7 Protection from Denial-of-Service Attacks .2

11、5 Annex A (normative) Implementation Conformance Statement (ICS) proforma 26 Annex B (informative) Example Message Sequences.34 ISO/IEC 17343:2007(E) iv ISO/IEC 2007 All rights reservedForeword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commi

12、ssion) form the specialized system for worldwide 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

13、 and IEC technical committees collaborate in fields 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

14、/IEC JTC 1. International Standards are drafted 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 nationa

15、l bodies for voting. Publication as an International 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

16、identifying any or all such patent rights. ISO/IEC 17343 was prepared by Ecma International (as ECMA-339) 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. Thi

17、s second edition cancels and replaces the first edition (ISO/IEC 17343:2004), which has been technically revised. ISO/IEC 17343:2007(E) ISO/IEC 2007 All rights reserved v Introduction This International Standard is one of a series of Standards defining the interworking of services and signalling pro

18、tocols deployed in corporate telecommunication networks (CNs) (also known as enterprise networks). The series uses telecommunication concepts as developed by ITU-T and conforms to the framework of International Standards on Open Systems Interconnection as defined by ISO/IEC. This International Stand

19、ard defines the signalling protocol interworking for basic services between a Private Integrated Services Network (PISN) and a packet-based private telecommunications network based on the Internet Protocol (IP). It is further assumed that the protocol for the PISN part is QSIG and that the protocol

20、for the IP-based network is SIP. Compared with the first edition of ISO 17343, this second edition includes numerous small changes arising during derived work in the IETF on RFC 4497. This second edition is in full technical alignment with RFC 4497. This International Standard is based upon the prac

21、tical experience of member companies and the results of their active and continuous participation in the work of ISO/IEC JTC 1, ITU-T, ETSI and other international and national standardization bodies. It represents a pragmatic and widely based consensus. In this International Standard, the key words

22、 “MUST“, “MUST NOT“, “REQUIRED“, “SHALL“, “SHALL NOT“, “SHOULD“, “SHOULD NOT“, “RECOMMENDED“, “MAY“, and “OPTIONAL“ are to be interpreted as described in RFC 2119 4 and indicate requirement levels for compliant SIP implementations. INTERNATIONAL STANDARD ISO/IEC 17343:2007(E) ISO/IEC 2007 All rights

23、 reserved 1 Information technology Telecommunications and information exchange between systems Corporate telecommunication networks Signalling interworking between QSIG and SIP Basic services 1 Scope This International Standard specifies signalling interworking between QSIG and the Session Initiatio

24、n Protocol (SIP) in support of basic services within a corporate telecommunication network (CN) (also known as enterprise network). QSIG is a signalling protocol that operates between Private Integrated services Network eXchanges (PINX) within a Private Integrated Services Network (PISN). A PISN pro

25、vides circuit-switched basic services and supplementary services to its users. QSIG is specified in other Standards; in particular 2 (call control in support of basic services), 3 (generic functional protocol for the support of supplementary services), and a number of standards specifying individual

26、 supplementary services. NOTE The name QSIG was derived from the fact that it is used for signalling at the Q reference point. The Q reference point is a point of demarcation between two PINXs. SIP is an application-layer protocol for establishing, terminating, and modifying multimedia sessions. It

27、is typically carried over IP 15, 16. Telephone calls are considered a type of multimedia session where just audio is exchanged. SIP is defined in 10. As the support of telephony within corporate networks evolves from circuit-switched technology to Internet technology, the two technologies will coexi

28、st in many networks for a period, perhaps several years. Therefore, there is a need to be able to establish, modify, and terminate sessions involving a participant in the SIP network and a participant in the QSIG network. Such calls are supported by gateways that perform interworking between SIP and

29、 QSIG. This International Standard specifies SIP-QSIG signalling interworking for basic services that provide a bi- directional transfer capability for speech, DTMF, facsimile, and modem media between a PISN employing QSIG and a corporate IP network employing SIP. Other aspects of interworking, e.g.

30、, the use of RTP and SDP, will differ according to the type of media concerned and are outside the scope of this International Standard. Call-related and call-independent signalling in support of supplementary services is outside the scope of this International Standard, but support for certain supp

31、lementary services (e.g., call transfer, call diversion) could be the subject of future work. Interworking between QSIG and SIP permits a call originating at a user of a PISN to terminate at a user of a corporate IP network, or a call originating at a user of a corporate IP network to terminate at a

32、 user of a PISN. Interworking between a PISN employing QSIG and a public IP network employing SIP is outside the scope of this International Standard. However, the functionality specified in this International Standard is in principle applicable to such a scenario when deployed in conjunction with o

33、ther relevant functionality (e.g., number translation, security functions, etc.). This International Standard is applicable to any interworking unit that can act as a gateway between a PISN employing QSIG and a corporate IP network employing SIP. ISO/IEC 17343:2007(E) 2 ISO/IEC 2007 All rights reser

34、ved2 Conformance In order to conform to this International Standard, a gateway shall satisfy the requirements identified in the Implementation Conformance Statement (ICS) proforma in Annex A. 3 Normative references The following referenced documents are indispensable for the application of this docu

35、ment. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. 1 ISO/IEC 11571:1998, Information technology Telecommunications and information exchange between systems Private Integrated Services N

36、etworks Addressing 2 ISO/IEC 11572:2000, Information technology Telecommunications and information exchange between systems Private Integrated Services Network Circuit mode bearer services Inter-exchange signalling procedures and protocol 3 ISO/IEC 11582:2002, Information technology Telecommunicatio

37、ns and information exchange between systems Private Integrated Services Network Generic functional protocol for the support of supplementary services Inter-exchange signalling procedures and protocol 4 RFC 2119, Key words for use in RFCs to Indicate Requirement Levels, BCP 14, S. Bradner 5 RFC 793,

38、Transmission Control Protocol, STD 7, J. Postel 6 RFC 768, User Datagram Protocol, STD 6, J. Postel 7 RFC 2246, The TLS Protocol Version 1.0, T. Dierks and C. Allen 8 RFC 2327, SDP: Session Description Protocol, M. Handley and V. Jacobson 9 RFC 2960, Stream Control Transmission Protocol, R. Stewart,

39、 Q. Xie, K. Morneault, C. Sharp, H. Schwarzbauer, T. Taylor, I. Rytina, M. Kalla, L. Zhang, and V. Paxson 10 RFC 3261, SIP: Session Initiation Protocol, J. Rosenberg, H. Schulzrinne, G. Camarillo, A. Johnston, J. Peterson, R. Sparks, M. Handley, and E. Schooler 11 RFC 3262, Reliability of Provisiona

40、l Responses in the Session Initiation Protocol (SIP), J. Rosenberg and H. Schulzrinne 12 RFC 3264, An Offer/Answer Model with the Session Description Protocol (SDP), J. Rosenberg and H. Schulzrinne 13 RFC 3323, A Privacy Mechanism for the Session Initiation Protocol (SIP), J. Peterson 14 RFC 3325, P

41、rivate Extensions to the Session Initiation Protocol (SIP) for Asserted Identity within Trusted Networks, C. Jennings, J. Peterson, and M. Watson 15 RFC 791, Internet Protocol, STD 5, J. Postel 16 RFC 2460, Internet Protocol, Version 6 (IPv6) Specification, S. Deering and R. Hinden 17 ITU-T Recommen

42、dation E.164, The international public telecommunication numbering plan“ 18 RFC 3578, Mapping of Integrated Services Digital Network (ISDN), User Part (ISUP), Overlap Signalling to the Session Initiation Protocol (SIP), G. Camarillo, A. Roach, J. Peterson, and L. Ong ISO/IEC 17343:2007(E) ISO/IEC 20

43、07 All rights reserved 3 19 RFC 3311, The Session Initiation Protocol (SIP) UPDATE Method, J. Rosenberg 20 RFC 3420, Internet Media Type message/sipfrag, R. Sparks 4 Terms and definitions For the purposes of this document, the terms and definitions given in ISO/IEC 11572, RFC 3261 and the following

44、apply. 4.1 corporate telecommunication network CN sets of privately-owned or carrier-provided equipment that are located at geographically dispersed locations and are interconnected to provide telecommunication services to a defined group of users NOTE A CN can comprise a PISN, a private IP network

45、(intranet), or a combination of the two. 4.2 gateway entity that performs interworking between a PISN using QSIG and an IP network using SIP 4.3 IP network network (unless otherwise stated, a corporate network) offering connectionless packet-mode services based on the Internet Protocol (IP) as the n

46、etwork-layer protocol 4.4 media stream audio or other user information transmitted in UDP packets, typically containing RTP, in a single direction between the gateway and a peer entity participating in a session established using SIP NOTE Normally a SIP session establishes a pair of media streams, o

47、ne in each direction. 4.5 private integrated services network PISN CN or part of a CN that employs circuit-switched technology 4.6 private integrated services network exchange PINX PISN nodal entity comprising switching and call handling functions and supporting QSIG signalling in accordance with IS

48、O/IEC 11572:2000 5 Abbreviated terms DNS Domain Name Service IP Internet Protocol PINX Private Integrated services Network eXchange PISN Private Integrated Services Network RTP Real-time Transport Protocol SCTP Stream Control Transmission Protocol ISO/IEC 17343:2007(E) 4 ISO/IEC 2007 All rights rese

49、rvedSDP Session Description Protocol SIP Session Initiation Protocol TCP Transmission Control Protocol TLS Transport Layer Security TU Transaction User UA User Agent UAC User Agent Client UAS User Agent Server UDP User Datagram Protocol 6 Background and Architecture During the 1980s, corporate voice telecommunications adopted technology similar in principle to Integrated Services Digital Networks (ISDN). Digital circuit switches, commonly known a