1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T G.799.1/Y.1451.1TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (06/2004) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital terminal equipments Other terminal equipment SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PRO
2、TOCOL ASPECTS AND NEXT GENERATION NETWORKS Internet protocol aspects Interworking Functionality and interface specifications for GSTN transport network equipment for interconnecting GSTN and IP networks ITU-T Recommendation G.799.1/Y.1451.1 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MED
3、IA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300G.399 GENERAL CHARACTERISTI
4、CS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TESTING EQUIPMENTS G.500G.599 TRANSMISSION MEDIA CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.70
5、0G.799 General G.700G.709 Coding of analogue signals by pulse code modulation G.710G.719 Coding of analogue signals by methods other than PCM G.720G.729 Principal characteristics of primary multiplex equipment G.730G.739 Principal characteristics of second order multiplex equipment G.740G.749 Princi
6、pal characteristics of higher order multiplex equipment G.750G.759 Principal characteristics of transcoder and digital multiplication equipment G.760G.769 Operations, administration and maintenance features of transmission equipment G.770G.779 Principal characteristics of multiplexing equipment for
7、the synchronous digital hierarchy G.780G.789 Other terminal equipment G.790G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 QUALITY OF SERVICE AND PERFORMANCE - GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DIGITAL
8、TERMINAL EQUIPMENTS G.7000G.7999 DIGITAL NETWORKS G.8000G.8999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. G.799.1/Y.1451.1 (06/2004) i ITU-T Recommendation G.799.1/Y.1451.1 Functionality and interface specifications for GSTN transport network equipment for int
9、erconnecting GSTN and IP networks Summary Voice and voiceband traffic in international networks has traditionally been transported by circuit switched systems and equipment. With the advent of the networks optimized for the transport of Internet Protocol (IP), and as a result of its considerable gro
10、wth and pervasive nature, more and more voice traffic is expected to be carried over IP networks. Given that voice and voiceband services remain a significant part of telecommunications, there is a need to ensure a high quality of service for voice carried in part, or wholly, via IP. This Recommenda
11、tion defines interfaces and functionality for equipment that interconnect GSTN networks at the TDM interface and networks optimized for the transport of IP, such that they will provide the degree of voice quality and interoperability required. Source ITU-T Recommendation G.799.1/Y.1451.1 was approve
12、d on 13 June 2004 by ITU-T Study Group 15 (2001-2004) under the ITU-T Recommendation A.8 procedure. Keywords Bearer interface, echo canceller, end-to-end transmission performance, fax over IP, gateway, Internet gateway, Internet protocol, IP gateway, media gateway, media gateway controller, quality
13、of service, signalling interface, speech coding, signalling interface, TDM, TDM-IP gateway, TIGIN, VoIP, voice gateway, voice over IP, voice quality. ii ITU-T Rec. G.799.1/Y.1451.1 (06/2004) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the fiel
14、d of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The Wor
15、ld Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In
16、 some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recog
17、nized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The wor
18、ds “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that
19、 the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendati
20、on development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and ar
21、e therefore strongly urged to consult the TSB patent database. ITU 2004 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. G.799.1/Y.1451.1 (06/2004) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Terms
22、and definitions . 4 4 Abbreviations 5 5 Conventions 7 6 General description of GSTN transport network equipment for interconnecting GSTN and IP networks (TIGIN) 8 7 Interfaces. 9 7.1 IP bearer interfaces. 10 7.2 GSTN (TDM) bearer interfaces 11 7.3 TIGIN control interfaces 12 7.4 TDM signalling inter
23、face . 14 7.5 Management interface 15 8 TIGIN functionality 15 8.1 Signal processing functions 15 8.2 Speech quality 21 8.3 Switching 22 8.4 Clock recovery and synchronization 22 8.5 Security. 23 8.6 Additional features . 23 8.7 Management functions and management system interfaces 23 Appendix I Ove
24、rview of the location of TIGIN gateways in end-to-end connections. 29 Appendix II Further information on performance/interworking and synchronization . 30 II.1 Performance/interworking 30 II.2 RTP timestamps 31 Appendix III TIGIN equipment arrangements 31 Appendix IV Mapping of E-model (G.107) param
25、eters from IETF RFC 3611 metrics and determining R-factor 33 IV.1 The E-model . 33 IV.2 Parameters related to delay. 34 IV.3 Parameters related to packet loss 35 IV.4 Parameters related to noise. 36 IV.5 Parameters related to signal level and loudness . 36 IV.6 Parameters related to Echo . 36 IV.7 C
26、alculating R, MOS-LQ and MOS-CQ values 36 BIBLIOGRAPHY 37 ITU-T Rec. G.799.1/Y.1451.1 (06/2004) 1 ITU-T Recommendation G.799.1/Y.1451.1 Functionality and interface specifications for GSTN transport network equipment for interconnecting GSTN and IP networks 1 Scope This Recommendation covers the requ
27、irements of equipment that interconnects GSTN networks at the TDM interface and networks optimized for the transport of IP. Such equipment is referred to in this Recommendation as a TIGIN gateway. This Recommendation describes functionality such as voiceband coding and echo control, transport interf
28、aces, signalling interfaces, and OA users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The refer
29、ence to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T Recommendation G.109 (1999), Definition of categories of speech transmission quality. ITU-T Recommendation G.114 (2003), One-way transmission time. ITU-T Recommendation G.
30、168 (2004), Digital network echo cancellers. ITU-T Recommendation G.177 (1999), Transmission planning for voiceband services over hybrid Internet/PSTN connections. ITU-T Recommendation G.701 (1993), Vocabulary of digital transmission and multiplexing and pulse code modulation (PCM) terms. ITU-T Reco
31、mmendation G.703 (2001), Physical/electrical characteristics of hierarchical digital interfaces. ITU-T Recommendation G.704 (1998), Synchronous frame structures used at 1544, 6312, 2048, 8448 and 44 736 kbit/s hierarchical levels. 2 ITU-T Rec. G.799.1/Y.1451.1 (06/2004) ITU-T Recommendation G.707/Y.
32、1322 (2003), Network node interface for the synchronous digital hierarchy (SDH). ITU-T Recommendation G.711 (1988), Pulse code modulation (PCM) of voice frequencies. ITU-T Recommendation G.711 Appendix I (1999), A high quality low-complexity algorithm for packet loss concealment with G.711. ITU-T Re
33、commendation G.711 Appendix II (2000), A comfort noise payload definition for ITU-T G.711 use in packet-based multimedia communication systems. ITU-T Recommendation G.723.1 (1996), Speech coders: Dual rate speech coder for multimedia communications transmitting at 5.3 and 6.3 kbit/s. ITU-T Recommend
34、ation G.723.1 Annex A (1996), Silence compression scheme. ITU-T Recommendation G.726 (1990), 40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM). ITU-T Recommendation G.727 (1990), 5-, 4-, 3- and 2-bit/sample embedded adaptive differential pulse code modulation (ADPCM). ITU-T R
35、ecommendation G.728 (1992), Coding of speech at 16 kbit/s using low-delay code excited linear prediction. ITU-T Recommendation G.728 Annex I (1999), Frame or packet loss concealment for the LD-CELP decoder. ITU-T Recommendation G.729 (1996), Coding of speech at 8 kbit/s using conjugate-structure alg
36、ebraic-code-excited linear/prediction (CS-ACELP). ITU-T Recommendation G.729 Annex A (1996), Reduced complexity 8 kbit/s CS-ACELP speech codec. ITU-T Recommendation G.729 Annex B (1996), A silence compression scheme for G.729 optimized for terminals conforming to Recommendation V.70. ITU-T Recommend
37、ation G.784 (1999), Synchronous Digital Hierarchy (SDH) management. ITU-T Recommendation G.811 (1997), Timing characteristics of primary reference clocks. ITU-T Recommendation G.813 (2003), Timing characteristics of SDH equipment slave clocks (SEC). ITU-T Recommendation G.823 (2000), The control of
38、jitter and wander within digital networks which are based on the 2048 kbit/s hierarchy. ITU-T Recommendation G.824 (2000), The control of jitter and wander within digital networks which are based on the 1544 kbit/s hierarchy. ITU-T Recommendation G.825 (2000), The control of jitter and wander within
39、 digital networks which are based on the synchronous digital hierarchy (SDH). ITU-T Recommendation G.957 (1999), Optical interfaces for equipments and systems relating to the synchronous digital hierarchy. ITU-T Recommendation H.248.1 (2002), Gateway control protocol: Version 2. ITU-T Recommendation
40、 H.248.4 (2000), Gateway control protocol: Transport over Stream Control Transmission Protocol (SCTP). ITU-T Recommendation H.248.7 (2004), Gateway control protocol: Generic announcement package. ITU-T Rec. G.799.1/Y.1451.1 (06/2004) 3 ITU-T Recommendation H.248.10 (2001), Gateway control protocol:
41、Media gateway resource congestion handling package. ITU-T Recommendation H.248.11 (2002), Gateway control protocol: Media gateway overload control package. ITU-T Recommendation H.248.25 (2003), Gateway control protocol: Basic CAS packages. ITU-T Recommendation H.248.30 (2004), Gateway control protoc
42、ol: RTCP extended performance metrics packages. ITU-T Recommendation M.3100 (1995), Generic network information model. ITU-T Recommendation P.501 (2000), Test signals for use in telephonometry. ITU-T Recommendation P.502 (2000), Objective test methods for speech communication systems using complex t
43、est signals. ITU-T Recommendation P.862 (2001), Perceptual evaluation of speech quality (PESQ): An objective method for end-to-end speech quality assessment of narrow-band telephone networks and speech codecs. ITU-T Recommendation Q.52 (2001), Signalling between international switching centres and s
44、tand-alone echo control devices. ITU-T Recommendation Q.55 (1999), Signalling between signal processing network equipments (SPNE) and international switching centres (ISC). ITU-T Recommendation Q.115.0 (2002), Protocols for the control of signal processing network elements and functions. ITU-T Recom
45、mendation Q.115.1 (2002), Logic for the control of echo control devices and functions. ITU-T Recommendations Q.310-Q.332 (1988), Specifications of Signalling System R1. ITU-T Recommendations Q.400-Q.490 (1988), Specifications of Signalling System R2. ITU-T Recommendation Q.701 (1993), Functional des
46、cription of the message transfer part (MTP) of Signalling System No. 7. ITU-T Recommendation Q.702 (1988), Signalling data link. ITU-T Recommendation Q.703 (1996), Signalling link. ITU-T Recommendation Q.704 (1996), Signalling network functions and messages. ITU-T Recommendation T.38 (2004), Procedu
47、res for real-time Group 3 facsimile communication over IP networks. ITU-T Recommendation T.120 (1996), Data protocols for multimedia conferencing. ITU-T Recommendation V.18 (2000), Operational and interworking requirements for DCEs operating in the text telephone mode. ITU-T Recommendation V.150.1 (
48、2003), Modem-over-IP networks: Procedures for the end-to-end connection of V-series DCEs. ITU-T Recommendation X.509 (2000) | ISO/IEC 9594-8:2001, Information technology Open Systems Interconnection The Directory: Public-key and attribute certificate frameworks. IETF RFC 768 (1980), User Datagram Pr
49、otocol. IETF RFC 791 (1981), Internet Protocol DARPA Internet Program Protocol Specification. 4 ITU-T Rec. G.799.1/Y.1451.1 (06/2004) IETF RFC 793 (1981), Transmission Control Protocol: DARPA Internet Program Protocol Specification. IETF RFC 919 (1984), Broadcasting Internet Datagrams. IETF RFC 950 (1985), Internet Standard Subnetting Procedure. IETF RFC 2401 (1998), Security Architecture for the Internet Protocol. IETF RFC 2406 (1
