T-REC-T[1].38-200704-I!!MSW-E.doc资源-CSDN下载

t38，2007

需积分: 3 71 浏览量 2009-04-21 15:45:39 上传评论收藏 10.29MB DOC 举报

【国际电信联盟(ITU-T)T.38传真协议】是关于实时Group 3传真通信在IP网络上进行的标准协议，适用于2007年版本。这个标准详细规定了当传真传输不仅通过公共交换电话网(PSTN)或综合业务数字网(ISDN)，而且部分路径包括IP网络（如互联网）时，终端间进行Group 3传真传输的程序。 Group 3传真协议是指符合国际电报电话咨询委员会(CCITT)T系列标准的传真通信协议，主要用于发送黑白图像的文档。T.38协议的目的是确保即使在IP网络环境下，也能实现类似于传统PSTN或ISDN网络上的高质量、可靠和实时的传真传输。 2007年修订版的T.38协议对H.323、H.248.1、SIP（会话初始化协议）和SDP（会话描述协议）的呼叫建立过程进行了澄清，提高了T.38网关与Group 3传真机之间的兼容性。这表明T.38协议致力于适应VoIP（Voice over IP）环境，确保传真服务在现代IP通信系统中的无缝集成。 T.38协议包含了多个组件，如错误检测和纠正机制，以应对IP网络的不可预测性和丢包现象。它还支持各种传输速率，以适应不同带宽条件下的网络环境。此外，T.38协议允许通过G.711、G.729等编码方式将模拟传真信号转换为数字数据，以便在IP网络上传输。在更广泛的ITU-T T系列推荐标准中，T.38属于“终端用于电报服务”分类，涵盖了从T.0到T.99的一系列相关协议，这些协议涉及传真、静止图像压缩、字符编码、彩色表示、ISDN终端和协议、视频文本、多媒体会议数据协议、通信应用配置文件以及设备特性等多个方面。 T.38协议是实现IP网络上实时Group 3传真通信的关键技术，通过不断更新和优化，确保了在多样化的网络环境中传真服务的稳定性和效率。对于依赖于传真通信的企业和服务提供商来说，理解和应用T.38协议是至关重要的，因为它有助于他们在数字化转型过程中保持服务质量。

资源推荐

资源详情

资源评论

I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n

ITU-T

T.38

TELECOMMUNICATION

STANDARDIZATION SECTOR

OF ITU

(04/2007)

SERIES T: TERMINALS FOR TELEMATIC SERVICES

Facsimile – Group 3 protocols

Procedures for real-time Group 3 facsimile

communication over IP networks

ITU-T Recommendation T.38

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 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 World 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 some areas of information technology which fall within ITU-T's 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 recognized 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 words "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 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 Recommendation development 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, implementers

are cautioned that this may not represent the latest information and are therefore strongly urged to consult the

TSB patent database at http://www.itu.int/ITU-T/ipr/.

<<ITU<<2008

prior written permission of ITU.

ii $%&'()

*+,-,"

.

1 Scope............................................................................................................................. 1

2 Normative references.................................................................................................... 1

3 Definitions..................................................................................................................... 2

4 Abbreviations................................................................................................................ 2

5 Introduction................................................................................................................... 3

6 Communication between gateways............................................................................... 5

6.1 Internet protocol – TCP or UDP..................................................................... 5

6.2 Gateway facsimile data transfer functions...................................................... 5

7 IFT protocol definition and procedures........................................................................ 6

7.1 General............................................................................................................ 6

7.2 IFP packet format............................................................................................ 8

7.3 TYPE definitions............................................................................................ 9

7.4 The IFP DATA element.................................................................................. 11

7.5 Limitation of V.21 frame packet size............................................................. 13

8 IFP message flow for facsimile modulations up to V.17.............................................. 14

8.1 Data rate management method 1.................................................................... 14

8.2 Data rate management method 2.................................................................... 14

9 IFT over UDP transport................................................................................................ 15

9.1 IFT over UDP transport using UDPTL protocol: IFT/UDPTL/UDP............. 15

9.2 IFT over UDP transport using RTP protocol: IFT/RTP/UDP........................ 17

10 Message flow for V.8 signals and Annex F/V.34 facsimile......................................... 18

10.1 V.8 negotiation................................................................................................ 18

10.2 V.34 data rate management............................................................................ 19

10.3 Facsimile mode............................................................................................... 21

10.4 Compatibility with equipment conforming to prior versions of this

Recommendation............................................................................................ 23

Annex A – ASN.1 notation...................................................................................................... 24

A.1 T.38 (2002) ASN.1 notation........................................................................... 24

A.2 T.38 (1998) ASN.1 notation........................................................................... 25

Annex B – H.323 call establishment procedures..................................................................... 27

B.1 Introduction..................................................................................................... 27

B.2 Communication between facsimile terminal and gateway............................. 27

B.3 Communication between gateways................................................................ 27

Annex C – The optional forward error correction scheme for UDPTL................................... 34

C.1 Overview of the optional forward error correction mechanism...................... 34

C.2 Parity encode/decode scheme operation and characteristics.......................... 34

$%&'() iii

剩余63页未读，继续阅读

评论收藏

内容反馈

guyong007

粉丝: 1

T-REC-T[1].38-200704-I!!MSW-E.doc

T-REC-T.Imp38-200002-S!!MSW-E.doc

T-REC-G.984.3-200803-I!!MSW-E.doc

T-REC-G[1].806-200603

T-REC-G.719-200806-I!!SOFT-ZST-E.zip_719_G.719_G.719-200806_Soft

ITU-T G.722.1建议书 中文版

G729系列文档集合大全

BT601 BT656 BT709 BT1120

ITU-T.rar_ITU-T

x86平台h.264 main profile全规格高性能解码库

BT.709 英文标准文档

ITU-R BT1700

ITU-R BT1702

仿真电路以及操作方法

【纯干货啊】华为IPD流程管理(完整版).pptx

信号与系统——保研复习资料.pdf

python大作业 含爬虫、数据可视化、地图、报告、及源码（整和为一个文件）（2014-2020全国各地区原油加工量）.rar

可编程语言标准IEC61131-3中文版.pdf

Landsat_WRS2.zip

数字信号处理——保研复习资料.pdf

使用STM32F103C8T6+L298N+MG513P30电机使用外部中断法和输入捕获法进行编码器测速

系统规划与管理师全套资料.zip

线性代数——保研复习资料.pdf

中国行政区划矢量数据WGS84免费下载

离散数学及其应用第八版偶数题答案

通信原理——保研复习资料.pdf

风电和储能并网Simulink模型

模型预测控制陈虹.pdf

数字信号处理PDF完整本(程佩青)-专业指导文档类资源

CISP题库（带答案）【精品】

【Android】Bitmap图像色彩模式：黑白、模糊、老照片、胶卷等（92/100）

数据库前沿：ADC 2023会议精华

最新资源

ITU-T G.722.1建议书中文版

python大作业含爬虫、数据可视化、地图、报告、及源码（整和为一个文件）（2014-2020全国各地区原油加工量）.rar