ISO IEC 21992-2003 Information technology - Telecommunications and information exchange between systems Private Integrated Services Network - Mapping Functions .pdf

1、 Reference number ISO/IEC 21992:2003(E) ISO/IEC 2003INTERNATIONAL STANDARD ISO 21992 First edition 2003-06-01 Information technology Telecommunications and information exchange between systems Private Integrated Services Network Mapping functions for the tunnelling of QSIG through IP networks Techno

2、logies de linformation Tlcommunications et change dinformation entre systmes Rseau priv intgration de services Trac de fonctions pour le tunnelling de QSIG par des rseaux IP ISO/IEC 21992:2003(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy,

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5、nsure 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. ISO/IEC 2003 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or

6、 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 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11

7、 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO/IEC 2003 All rights reservedISO/IEC 21992:2003(E) ISO/IEC 2003 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Conformance. 1 3 Normative references. 1 4 Terms and definitions.

8、2 4.1 External definitions. 2 4.2 Other definitions. 2 5 List of acronyms . 3 6 Introduction. 3 6.1 Reference configuration. 3 6.2 Specific scenarios. 4 7 Capabilities at the Q reference point 4 8 Capabilities at the C reference point. 5 8.1 TCP connection. 5 8.2 UDP streams 6 9 Mapping functions 6

9、9.1 Mapping the D Q -channel. 6 9.2 Mapping a U Q -channel 6 10 IPC control functions 6 10.1 Procedure for U Q -channel establishment. 6 10.2 Procedure for U Q -channel clearing . 7 Annex A (informative) Implementation Conformance Statement (ICS) Proforma . 8 A.1 Introduction. 8 A.2 Instructions for

10、 completing the ICS proforma . 8 A.2.1 General structure of the ICS proforma . 8 A.2.2 Additional information 9 A.2.3 Exception information 9 A.3 ICS proforma for ISO/IEC 21992 10 A.3.1 Implementation identification 10 A.3.2 Implementation summary. 10 A.4 General requirements. 10 A.5 U Q -channel be

11、arer capabilities at the Q reference point. 11 A.6 D Q -channel capability at the Q reference point 11 A.7 Capabilities at the C reference point. 11 A.8 Mapping functions 11 A.9 IPC control functions 12 A.10 Support of resource control information 12 A.10.1 Support of bearer capabilities information

12、 12 A.10.2 Support of IP address type 12 Annex B (normative) Message syntax for Resource Control Information . 13 B.1 Introduction. 13 B.2 Message syntax. 13 B.2.1 Resource control header 13 B.2.2 Protocol indicator. 13 B.2.3 Resource control information 13 ISO/IEC 21992:2003(E) iv ISO/IEC 2003 All

13、rights reservedForeword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards

14、 through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC,

15、 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 in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of the joint technical committee is to

16、 prepare International Standards. Draft International Standards adopted by the joint technical committee are circulated to national 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 possibil

17、ity 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/IEC 21992 was prepared by ECMA (as ECMA-336) and was adopted, under a special “fast-track procedure”, by Joint Technical Co

18、mmittee ISO/IEC JTC 1, Information technology, in parallel with its approval by national bodies of ISO and IEC. ISO/IEC 21992:2003(E) ISO/IEC 2003 All rights reserved vIntroduction This International Standard is one of a series of standards defining mapping functions in exchanges of Private Integrat

19、ed Services Networks required for the utilization of intervening network scenarios. The series uses the ISDN concepts as developed by ITU-T (formerly CCITT) and is also within the framework of standards for open systems interconnection as defined by ISO/IEC. This International Standard is based upon

20、 the practical experience of ECMA 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. INTERNATIONAL STANDARD ISO/IEC

21、21992:2003(E) ISO/IEC 2003 All rights reserved 1Information technology Telecommunications and information exchange between systems Private Integrated Services Network Mapping functions for the tunnelling of QSIG through IP networks 1 Scope This International Standard specifies functions for using a

22、packet network that uses the Internet Protocol (IP) as its network layer protocol and UDP and TCP as its transport layer protocols, to interconnect two Private Integrated services Network eXchanges (PINXs) forming part of a Private Integrated Services Network (PISN). Interconnection is achieved by c

23、arrying the inter-PINX signalling protocol directly over the Transmission Control Protocol (TCP) and inter-PINX user information (e.g., voice) over the Real-time Transport Protocol (RTP), RTP being carried over the User Datagram Protocol (UDP). The inter-PINX signalling protocol is assumed to be QSI

24、G, as specified in ISO/IEC 11572, ISO/IEC 11582 and other International Standards. This International Standard provides for two types of interconnection: on-demand, where a separate TCP connection for QSIG is established at the start of each call and cleared down at the end of that call; and semi-pe

25、rmanent, where a single TCP connection with an indefinite lifetime carries QSIG on behalf of many single calls. This International Standard is applicable to PINXs that can be interconnected to form a PISN using QSIG as the inter-PINX signalling protocol. 2 Conformance In order to conform to this Int

26、ernational Standard, a PINX 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 document. For dated references, only the edition cited

27、applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO/IEC 11572:2000, Information technology Telecommunications and information exchange between systems Private Integrated Services Network Circuit mode bearer services Inter-exchange si

28、gnalling procedures and protocol ISO/IEC 11574:2000, Information technology Telecommunications and information exchange between systems Private Integrated Services Network Circuit-mode 64 kbit/s bearer services Service description, functional capabilities and information flows ISO/IEC 11579-1:1994,

29、Information technology Telecommunications and information exchange between systems Private integrated services network Part 1: Reference configuration for PISN Exchanges (PINX) ISO/IEC 11582:2002, Information technology Telecommunications and information exchange between systems Private Integrated S

30、ervices Network Generic functional protocol for the support of supplementary services Inter-exchange signalling procedures and protocol ISO/IEC 21992:2003(E) 2 ISO/IEC 2003 All rights reservedITU-T Rec. I.112:1993, Vocabulary of terms for ISDNs ITU-T Rec. I.210:1993, Principles of telecommunication

31、services supported by an ISDN and the means to describe them IETF RFC 760, Internet Protocol IETF RFC 761, Transmission Control Protocol IETF RFC 768, User Datagram Protocol IETF RFC 1889, RTP: A Transport Protocol for Real-Time Applications IETF RFC 2126, ISO Transport Service on top of TCP (ITOT)

32、4 Terms and definitions For the purposes of this document, the following terms and definitions apply. 4.1 External definitions This International Standard uses the following terms defined in other documents: IVN (ISO/IEC 11579-1) PINX (ISO/IEC 11579-1) PISN (ISO/IEC 11579-1) Service (ITU-T Rec. I.11

33、2) Signalling (ITU-T Rec. I.112) 4.2 Other definitions 4.2.1 Calling PINX In the context of a call or call-independent signalling connection across an IPL, the PINX that transmits the QSIG SETUP message. 4.2.2 Called PINX In the context of a call or call-independent signalling connection across an I

34、PL, the PINX that receives the QSIG SETUP message. 4.2.3 Channel A means of bi-directional transmission of user or signalling information between two points. 4.2.3.1 D Q -Channel A channel used to convey call control information between the Q reference points of two peer PINXs. 4.2.3.2 U Q -Channel

35、A channel used to convey user information between the Q reference points of two peer PINXs. ISO/IEC 21992:2003(E) ISO/IEC 2003 All rights reserved 34.2.4 Resource Control Information Information exchanged between peer PINXs for the purpose of establishing UDP streams. 4.2.5 Inter-PINX Connection (IP

36、C) A connection provided by an IVN between two C reference points used to transport inter-PINX information from the PISN control plane and/or the PISN user plane. 4.2.6 QPKT A packet format defined within this International Standard for conveying QSIG message and RCI (Resource Control Information).

37、5 List of acronyms IP Internet Protocol IPC Inter-PINX connection IPL Inter-PINX Link IVN InterVening Network PINX Private Integrated services Network eXchange PISN Private Integrated Services Network QSIG Signalling information flows at the Q reference point RCI Resource Control Information RTCP Re

38、altime Transport Control Protocol RTP Realtime Transport Protocol TCP Transmission Control Protocol UDP User Datagram Protocol 6 Introduction 6.1 Reference configuration ISO/IEC 11579-1 defines a reference configuration for a PINX. Logically the switching and call control functions of a PINX communi

39、cate over an instance of the Q reference point with a peer PINX. This communication is known as an Inter-PINX Link (IPL) and comprises a signalling channel, known as a D Q - channel, and one or more user information channels, each known as a U Q -channel; see Figure 1. One or more IPLs can be establ

40、ished between the same pair of PINXs. Switching and Call Control functions D Q-channel U Q-channel U Q-channel Q reference point Switching and Call Control functions Inter-PINX link PINX PINX Q reference pointFigure 1 IPL concept There are many ways of implementing an IPL. In general, the IPL uses s

41、ervices of another network, known as an Intervening Network (IVN). A PINX interfaces to the IVN at the C reference point. The IVN provides ISO/IEC 21992:2003(E) 4 ISO/IEC 2003 All rights reservedconnections, known as Inter-PINX Connections (IPCs) between the C reference points of the peer PINXs. Map

42、ping functions within each PINX map the D Q -channel and the U Q -channels at the Q reference point onto one or more IPCs at the C reference point. 6.2 Specific scenarios This International Standard specifies mapping functions for use when the IVN is an IP-based network that is used to provide the f

43、ollowing types of IPC: a TCP connection for carrying signalling information and Resource Control Information; and a pair of UDP streams, one stream in each direction, for carrying user information over RTP. A single IPL requires a single TCP connection, for support of the D Q -channel, and one pair

44、of UDP streams per U Q -channel. In addition to carrying the QSIG protocol, the TCP connection is also required to carry resource control information for establishing the UDP streams. This International Standard supports two types of interconnection between peer PINXs: On-demand, where a single TCP

45、connection for QSIG and a pair of UDP streams for user information are established at the start of each call and cleared down at the end of that call; Semi-permanent, where a single TCP connection with an indefinite lifetime carries QSIG on behalf of many calls. In the semi-permanent case, the TCP c

46、onnection can support zero, one or more than one call at the same time. A pair of UDP streams for user information is established at the start of each call and cleared down at the end of that call. Figure 2 illustrates these concepts. PINX IVN (IP network) Switching and Call Control functions D Q-ch

47、annel U Q-channel U Q -channel Q reference point Q reference point Switching and Call Control functions Inter-PINX link PINX Mapping functions C reference point D Q -channel U Q -channel U Q -channel Mapping functions C reference point Inter-PINX connections TCP connection Pair of UDP streams Pair o

48、f UDP streamsFigure 2 IPC concept (Semi-permanent) 7 Capabilities at the Q reference point For each instance of the Q reference point: one signalling channel (D Q ) for carrying the inter-PINX Layer 3 signalling protocol, and zero, one or more user channels (U Q ) shall be provided. NOTE In the spec

49、ial case of an on-demand interconnection used only for a call independent signalling connection, no U Q-channels are provided. ISO/IEC 21992:2003(E) ISO/IEC 2003 All rights reserved 5For a U Q -channel the following bearer capability shall be provided: transfer mode: circuit mode; information transfer rate: 64 kbit/s; information transfer capability: speech or 3,1 kHz audio; user information layer 1 protocol: G.711 A or law. Other bearer capabiliti