1、 International Telecommunication Union ITU-T H.248.2TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (03/2013) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMSInfrastructure of audiovisual services Communication procedures Gateway control protocol: Facsimile, text conversation and call discrimination pac
2、kages Recommendation ITU-T H.248.2 ITU-T H-SERIES RECOMMENDATIONS AUDIOVISUAL AND MULTIMEDIA SYSTEMS CHARACTERISTICS OF VISUAL TELEPHONE SYSTEMS H.100H.199 INFRASTRUCTURE OF AUDIOVISUAL SERVICES General H.200H.219 Transmission multiplexing and synchronization H.220H.229 Systems aspects H.230H.239 Co
3、mmunication procedures H.240H.259Coding of moving video H.260H.279 Related systems aspects H.280H.299 Systems and terminal equipment for audiovisual services H.300H.349 Directory services architecture for audiovisual and multimedia services H.350H.359 Quality of service architecture for audiovisual
4、and multimedia services H.360H.369 Supplementary services for multimedia H.450H.499 MOBILITY AND COLLABORATION PROCEDURES Overview of Mobility and Collaboration, definitions, protocols and procedures H.500H.509 Mobility for H-Series multimedia systems and services H.510H.519 Mobile multimedia collab
5、oration applications and services H.520H.529 Security for mobile multimedia systems and services H.530H.539 Security for mobile multimedia collaboration applications and services H.540H.549 Mobility interworking procedures H.550H.559 Mobile multimedia collaboration inter-working procedures H.560H.56
6、9 BROADBAND, TRIPLE-PLAY AND ADVANCED MULTIMEDIA SERVICES Broadband multimedia services over VDSL H.610H.619 Advanced multimedia services and applications H.620H.629 Ubiquitous sensor network applications and Internet of Things H.640H.649 IPTV MULTIMEDIA SERVICES AND APPLICATIONS FOR IPTV General as
7、pects H.700H.719 IPTV terminal devices H.720H.729 IPTV middleware H.730H.739 IPTV application event handling H.740H.749 IPTV metadata H.750H.759 IPTV multimedia application frameworks H.760H.769 IPTV service discovery up to consumption H.770H.779 Digital Signage H.780H.789 For further details, pleas
8、e refer to the list of ITU-T Recommendations. Rec. ITU-T H.248.2 (03/2013) i Recommendation ITU-T H.248.2 Gateway control protocol: Facsimile, text conversation and call discrimination packages Summary Recommendation ITU-T H.248.2 defines packages that extend the applicability of the ITU-T H.248.1 G
9、ateway Control Protocol Recommendation. Specifically, this Recommendation describes packages for fax, text telephone, call type discrimination and data call detection for use with the ITU-T H.248.1 Gateway Control Protocol. As defined in Recommendation ITU-T H.248.1, a “package“ is an extension to I
10、TU-T H.248.1 that supports specific behaviour. The packages are intended for control over gateway functions for transport of facsimile or text conversation between different network environments. Extensions can be made for other kinds of data transport. The Call Type Discrimination package defines c
11、ontrol and monitoring of a line for the signalling protocols used in the beginning of a session of data transmission for fax, text telephony or data. This package has been revised to enable the MG to autonomously determine the call type to be supported. The Text Telephone package defines control of
12、a text telephone session in any of the modes supported by the automoding text telephone Recommendation, ITU-T V.18. The Fax package defines control of a fax transmission. The Fax/Textphone/Modem Tones Detection package defines control over a termination for detection of any signals from a fax, text
13、telephone or data modem during a connection in voice mode. The Text Conversation package defines control over a real-time interactive text conversation session using a universal presentation format and transferred with a transport method from a multimedia protocol in any network environment. The IP
14、Fax package defines control over facsimile transmission in a packet network. All the packages have been editorially modified to align with the ITU-T H.248.1 packages template. Amendment 1 (2007) to the 2005 revision provides an enhancement to the types of call that may be discriminated through in-ba
15、nd signalling. It groups existing call types into like types. It provides an explanation of when those types are used. Several new call types are added to the Discriminated Call Type event. The Call discrimination flows have been corrected with the correct events. This 2013 revision incorporates a c
16、orrection to the example call flow in Appendix I. NOTE This Recommendation has been renumbered. It was previously known as Recommendation ITU-T H.248, Annex F. History Edition Recommendation Approval Study Group 1.0 ITU-T H.248 Annex F 2000-11-17 16 1.0 ITU-T H.248.2 2000-11-17 16 2.0 ITU-T H.248.2
17、2005-01-08 16 2.1 ITU-T H.248.2 (2005) Amd. 1 2007-01-13 16 3.0 ITU-T H.248.2 2013-03-16 16 ii Rec. ITU-T H.248.2 (03/2013) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies
18、 (ICTs). 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 Telecommunica
19、tion 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 i
20、nformation 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 recognized operating
21、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
22、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
23、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
24、 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, implementers are cautioned that this may not represent the latest information and are therefore st
25、rongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2013 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T H.248.2 (03/2013) iii Table of Contents Page 1 Scope 1 2 Refe
26、rences. 1 3 Definitions 3 4 Abbreviations and acronyms 3 5 FAX/Textphone/Modem Tones Detection package . 4 5.1 Properties 4 5.2 Events . 4 5.3 Signals 5 5.4 Statistics 5 5.5 Procedures 5 6 Text Conversation package. 5 6.1 Properties 5 6.2 Events . 8 6.3 Signals 9 6.4 Statistics 9 6.5 Procedures 9 7
27、Text Telephone package . 11 7.1 Properties 13 7.2 Events . 16 7.3 Signals 17 7.4 Statistics 17 7.5 Procedures 17 8 Call Type Discrimination package . 19 8.1 Properties 20 8.2 Events . 23 8.3 Signals 27 8.4 Statistics 32 8.5 Procedures 32 9 Fax package 35 9.1 Properties 35 9.2 Events . 37 9.3 Signals
28、 37 9.4 Statistics 37 9.5 Procedures 38 10 IP Fax package 39 10.1 Properties 39 10.2 Events . 42 iv Rec. ITU-T H.248.2 (03/2013) Page 10.3 Signals 42 10.4 Statistics 43 10.5 Procedures 43 Appendix I Call discrimination flows . 45 Bibliography. 47 Rec. ITU-T H.248.2 (03/2013) 1 Recommendation ITU-T H
29、.248.2 Gateway control protocol: Facsimile, text conversation and call discrimination packages 1 Scope This Recommendation describes packages for the ITU-T H.248.1 gateway protocol related to data or telematic services. With terminations implementing these packages, a gateway is expected to handle i
30、nitial modem negotiations, and the communication in voice, fax and text telephone call types. It contains: Package “ftmd“ for general detection of signals on a fixed telephone line indicating a possible request to enter some data-related mode; Package “ctyp“ for general call discrimination to sort o
31、ut if a call should be handled as voice, fax, text telephone or modem data, and perform the initial negotiation; Package “txp“ for communicating with text telephones in the telephone network; Package “fax“ for communication with facsimile in the telephone network; Package “txc“ for general text conv
32、ersation in other environments; Package “ipfax“ for fax transmission in IP networks. 2 References 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
33、indicated were valid. All Recommendations and other references are subject to revision; 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
34、-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T H.224 Recommendation ITU-T H.224 (2005), A real time control protocol for simplex applications using the H.221 LSD/HSD/
35、MLP channels, plus Cor.1 (2007). ITU-T H.248.1 Recommendation ITU-T H.248.1 (2013), Gateway control protocol: Version 3. ITU-T H.320 Recommendation ITU-T H.320 (2004), Narrow-band visual telephone systems and terminal equipment. ITU-T H.323 Recommendation ITU-T H.323 (2009), Packet-based multimedia
36、communications systems. ITU-T H.324 Recommendation ITU-T H.324 (2009), Terminal for low bit-rate multimedia communication. ITU-T T.30 Recommendation ITU-T T.30 (2005), Procedures for document facsimile transmission in the general switched telephone network, plus Amd.1 (2007). ITU-T T.37 Recommendati
37、on ITU-T T.37 (1998), Procedures for the transfer of facsimile data via store-and-forward on the Internet, plus Amendments 1 (1999), 2 (2001) and 3 (2002). ITU-T T.38 Recommendation ITU-T T.38 (2010), Procedures for real-time Group 3 facsimile communication over IP networks, plus Erratum 1 (2013). 2
38、 Rec. ITU-T H.248.2 (03/2013) ITU-T T.50 Recommendation ITU-T T.50 (1992), International Reference Alphabet (IRA) (Formerly International Alphabet No. 5 or IA5) Information technology 7-bit coded character set for information interchange. ITU-T T.134 Recommendation ITU-T T.134 (1998), Text chat appl
39、ication entity. ITU-T T.140 Recommendation ITU-T T.140 (1998)/Add. 1 (2000), Protocol for multimedia application text conversation. ITU-T V.8 Recommendation ITU-T V.8 (2000), Procedures for starting sessions of data transmission over the public switched telephone network. ITU-T V.8 bis Recommendatio
40、n ITU-T V.8 bis (2000), Procedures for the identification and selection of common modes of operation between data circuit-terminating equipments (DCEs) and between data terminal equipments (DTEs) over the public switched telephone network and on leased point-to-point telephone-type circuits. ITU-T V
41、.17 Recommendation ITU-T V.17 (1991), A 2-wire modem for facsimile applications with rates up to 14 400 bit/s, plus Corrigendum 1 (1998). ITU-T V.18 Recommendation ITU-T V.18 (2000), Operational and interworking requirements for DCEs operating in the text telephone mode, plus Amendment 1 (2002). ITU
42、-T V.21 Recommendation ITU-T V.21 (1988), 300 bits per second duplex modem standardized for use in the general switched telephone network. ITU-T V.23 Recommendation ITU-T V.23 (1988), 600/1200-baud modem standardized for use in the general switched telephone network. ITU-T V.25 Recommendation ITU-T
43、V.25 (1996), Automatic answering equipment and general procedures for automatic calling equipment on the general switched telephone network including procedures for disabling of echo control devices for both manually and automatically established calls, plus Corrigendum 1 (2001). ITU-T V.27 ter Reco
44、mmendation ITU-T V.27 ter (1988), 4800/2400 bits per second modem standardized for use in the general switched telephone network. ITU-T V.34 Recommendation ITU-T V.34 (1998), A modem operating at signalling rates of up to 33 600 bit/s for use on the general switched telephone network and on leased p
45、oint-to-point 2-wire telephone-type circuits. ITU-T V.61 Recommendation ITU-T V.61 (1996), A simultaneous voice plus data modem, operating at a voice plus data signalling rate of 4800 bit/s, with optional automatic switching to data-only signalling rates of up to 14 400 bit/s, for use on the General
46、 Switched Telephone Network and on leased point-to-point 2-wire telephone type circuits. ITU-T V.90 Recommendation ITU-T V.90 (1998), A digital modem and analogue modem pair for use on the Public Switched Telephone Network (PSTN) at data signalling rates of up to 56 000 bit/s downstream and up to 33
47、 600 bit/s upstream. IETF RFC 3550 IETF RFC 3550 (2003), RTP: A Transport Protocol for Real-Time Applications. IETF RFC 4103 IETF RFC 4103 (2005), RTP Payload for Text Conversation. Rec. ITU-T H.248.2 (03/2013) 3 ISO/IEC 10646-1 ISO/IEC 10646-1:2000, Information technology Universal Multiple-Octet C
48、oded Character Set (UCS) Part 1: Architecture and Basic Multilingual Plane. 3 Definitions This Recommendation defines the following terms: 3.1 hexadecimal octet coding: Hexadecimal octet coding is a means for representing a string of octets as a string of hexadecimal digits, with two digits represen
49、ting each octet. Each octet is issued by the DTE or DCE in the same time sequence as transmitted on the GSTN line, with no intervening characters. For each octet, the 8-bit sequence is encoded as two hexadecimal digits. Bit 0 is the first transmitted; bit 7 is the last. Bits 7-4 are encoded as the first hexadecimal digit, with bit 7 as MSB and bit 4 as LSB. Bits 3-0 are encoded as the second hexadecimal digit, with bit 3 as MSB and bit 0 as LSB.
