1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T G.722.2TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Annex F(11/2002) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital terminal equipments Coding of analogue signals by methods other than PCM Wideband coding of speech at ar
2、ound 16 kbit/s using Adaptive Multi-Rate Wideband (AMR-WB) Annex F: AMR-WB usage in H.245 ITU-T Recommendation G.722.2 Annex F ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTI
3、CS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC
4、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.700G.799 General G.700G.709 Coding of analogue signals by pulse code modulation G.710G.719 Coding of analogue signal
5、s 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 Principal characteristics of higher order multiplex equipment G.750G.759 Principal characteristics of transcoder and dig
6、ital multiplication equipment G.760G.769 Operations, administration and maintenance features of transmission equipment G.770G.779 Principal characteristics of multiplexing equipment for the synchronous digital hierarchy G.780G.789 Other terminal equipment G.790G.799 DIGITAL NETWORKS G.800G.899 DIGIT
7、AL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 QUALITY OF SERVICE AND PERFORMANCE G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DIGITAL 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.7
8、22.2/Annex F (11/2002) i ITU-T Recommendation G.722.2 Wideband coding of speech at around 16 kbit/s using Adaptive Multi-Rate Wideband (AMR-WB) Annex F AMR-WB usage in H.245 Summary This annex specifies the packet format and capability signalling for G.722.2 Adaptive Multi-Rate Wideband (AMR-WB) for
9、 usage with H.245 specification. Both the format and the capability parameters are fully compatible with the corresponding AMR-WB RTP definitions to allow seamless interoperability. Source Annex F to ITU-T Recommendation G.722.2 was prepared by ITU-T Study Group 16 (2001-2004) and approved under the
10、 WTSA Resolution 1 procedure on 29 November 2002. ii ITU-T Rec. G.722.2/Annex F (11/2002) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent orga
11、n 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 World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the t
12、opics 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 some areas of information technology which fall within ITU-Ts purview, the necessary standards are p
13、repared 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 recognized operating agency. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the
14、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 Recommendation de
15、velopment process. As of the date of approval of this Recommendation, ITU had 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 are therefo
16、re strongly urged to consult the TSB patent database. ITU 2003 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.722.2/Annex F (11/2002) iii CONTENTS Page F.1 Scope 1 F.2 References 1 F.3 Introductio
17、n 1 F.4 ITU-T Rec. G.722.2 (Adaptive Multi-Rate Wideband) capability definitions for H.245 1 ITU-T Rec. G.722.2/Annex F (11/2002) 1 ITU-T Recommendation G.722.2 Wideband coding of speech at around 16 kbit/s using Adaptive Multi-Rate Wideband (AMR-WB) Annex F AMR-WB usage in H.245 F.1 Scope This anne
18、x specifies the packet format and capability signalling for G.722.2 Adaptive Multi-Rate Wideband (AMR-WB) 3 for usage with H.245 specification. Both the format and the capability parameters are fully compatible with the corresponding AMR-WB RTP definitions to allow seamless interoperability. F.2 Ref
19、erences The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; us
20、ers 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 reference to a document within this Recomme
21、ndation does not give it, as a stand-alone document, the status of a Recommendation. 1 SJOBERG (J.) et al., Real-Time Transport Protocol (RTP) Payload Format and File Storage Format for the Adaptive Multi-Rate (AMR) and Adaptive Multi-Rate Wideband (AMR-WB) Audio Codecs, RFC 3267, June 2002. 2 ITU-T
22、 Recommendation H.245 (2003), Control protocol for multimedia communication. 3 ITU-T Recommendation G.722.2 (2002), Wideband coding of speech at around 16 kbit/s using Adaptive Multi-Rate Wideband (AMR-WB). F.3 Introduction The packet format and corresponding capability signalling for the Adaptive M
23、ulti-Rate Wideband (AMR-WB) speech codec within Real-Time Transport Protocol (RTP) is specified in 1. This packet format is not merely a way to encapsulate AMR-WB speech frames into the payload of the RTP packet but also introduces a number of optional packetization features for enhanced robustness
24、against transmission errors. Furthermore, also a set of parameters for out-of-band signalling of packetizer capabilities is specified. This annex specifies the usage of the packet format defined in 1 and provides corresponding capability definitions for usage with H.245. This approach enables one-to
25、-one mapping between H.245 and a system using parameters specified in 1 (e.g. MIME signalling) thus providing full interoperability. F.4 ITU-T Rec. G.722.2 (Adaptive Multi-Rate Wideband) capability definitions for H.245 Table F.1 defines the capability identifier for G.722.2 (AMR-WB) capabilities. T
26、ables F.2 to F.10 define the associated capability parameters. The details of the packetization of speech frames of AMR-WB into the octet structure and mode signalling are specified in 1. Because of the request mode procedure provided by H.245 2, the in-band mode request mechanism specified in 1 sha
27、ll not be used, and the CMR field of the packet shall always be set to value 15 indicating “no request“. 2 ITU-T Rec. G.722.2/Annex F (11/2002) Table F.1/G.722.2 G.722.2 Capability identifier Capability name: G.722.2 (AMR-WB) audio capability Capability class: Audio codec Capability identifier type:
28、 Standard Capability identifier value: itu-t (0) recommendation (0) g (7) 7222 generic-capabilities (1) 0 maxBitRate: Shall be 239 NonCollapsingRaw: This field shall not be included transport: This field shall not be included Table F.2/G.722.2 G.722.2 Capability parameter maxAl-sduFrames Parameter n
29、ame: maxAl-sduFrames Parameter description: This is a collapsing GenericParameter. It specifies what is the maximum number of audio frames per AL-SDU. Parameter identifier value: 0 Parameter status: Shall be present for capability exchange and logical channel signalling. Shall not be present for mod
30、e request. Parameter type: UnsignedMin Supersedes: Table F.3/G.722.2 G.722.2 Capability parameter bitRate Parameter name: bitRate Parameter description: This is a nonCollapsing GenericParameter. It specifies the AMR bit-rate. This parameter shall be used in mode requests and in mode-set definitions
31、(see Table F.5). 0 = 6.60; 1 = 8.85; 2 = 12.65; 3 = 14.25; 4 = 15.85; 5 =18.25; 6 = 19.85; 7 = 23.05; 8 = 23.85 Parameter identifier value: 1 Parameter status: Optional Parameter type: UnsignedMin Supersedes: Table F.4/G.722.2 G.722.2 Capability parameter octet align Parameter name: octetAlign Param
32、eter description: This is a collapsing GenericParameter. It specifies whether the bandwidth efficient or octet-aligned mode of operation is used. If parameter is present and the value is TRUE, octet-aligned mode is used, otherwise the bandwidth efficient mode is used. Parameter identifier value: 2 P
33、arameter status: Optional Parameter type: Logical Supersedes: ITU-T Rec. G.722.2/Annex F (11/2002) 3 Table F.5/G.722.2 G.722.2 Capability parameter mode-set Parameter name: modeSet Parameter description: This is a collapsing GenericParameter. If present, it specifies the set of modes available for c
34、urrent session. If not present, all modes are available. Parameter identifier value: 3 Parameter status: Optional Parameter type: genericParameter. Parameter values (SET OF unsignedMin) indicate the G.722.2 modes (see Table F.3) supported for current session. Supersedes: Table F.6/G.722.2 G.722.2 Ca
35、pability parameter mode change period Parameter name: modeChangePeriod Parameter description: This is a collapsing GenericParameter. If present, it specifies the interval N (as number of frames) at which the mode changes are allowed. The initial phase is arbitrary, but the mode changes must be separ
36、ated by the multiple of N frames. If not present, mode changes are allowed at any time. Parameter identifier value: 4 Parameter status: Optional Parameter type: UnsignedMin Supersedes: Table F.7/G.722.2 G.722.2 Capability parameter mode change neighbour Parameter name: modeChangeNeighbour Parameter
37、description: This is a collapsing GenericParameter. If present and the value is TRUE, it specifies that the mode may be changed to a neighbouring mode within the specified mode-set. If not present or the value is FALSE, mode changes are allowed to any mode within the specified mode-set. Parameter id
38、entifier value: 5 Parameter status: Optional Parameter type: Logical Supersedes: 4 ITU-T Rec. G.722.2/Annex F (11/2002) Table F.8/G.722.2 G.722.2 Capability parameter crc Parameter name: crc Parameter description: This is a collapsing GenericParameter. If present and the value is TRUE, it specifies
39、that frame CRCs are included in the payload packet. If not present or the value is FALSE, CRCs are not included. Note that enabling CRC also implies usage of octet-aligned mode of operation. Parameter identifier value: 6 Parameter status: Optional Parameter type: Logical Supersedes: Table F.9/G.722.
40、2 G.722.2 Capability parameter robust sorting Parameter name: robustSorting Parameter description: This is a collapsing GenericParameter. If present and the value is TRUE, it specifies that the robust sorting is applied on the frames carried in the payload. If not present or the value is FALSE, simp
41、le payload sorting is used. Note that enabling robust sorting also implies usage of octet-aligned mode of operation. Parameter identifier value: 7 Parameter status: Optional Parameter type: Logical Supersedes: Table F.10/G.722.2 G.722.2 Capability parameter interleaving Parameter name: interleaving
42、Parameter description: This is a collapsing GenericParameter. If present, it specifies that frame level interleaving shall be applied for the payloads of this session, and the value specifies the maximum number of frames in an interleaving group. If not present, frames in the payload are not interle
43、aved. Note that enabling interleaving also implies usage of octet-aligned mode of operation. Parameter identifier value: 8 Parameter status: Optional Parameter type: UnsignedMin Supersedes: Printed in Switzerland Geneva, 2003 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T
44、 Series B Means of expression: definitions, symbols, classification Series C General telecommunication statistics Series D General tariff principles Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G T
45、ransmission systems and media, digital systems and networks Series H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L
46、Construction, installation and protection of cables and other elements of outside plant Series M TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Series N Maintenance: international sound programme and television transmiss
47、ion circuits Series O Specifications of measuring equipment Series P Telephone transmission quality, telephone installations, local line networks Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph services terminal equipment Series T Terminals for telematic services Series U Telegraph switching Series V Data communication over the telephone network Series X Data networks and open system communications Series Y Global information infrastructure and Internet protocol aspects Series Z Languages and general software aspects for telecommunication systems
