1、 International Telecommunication Union ITU-T H.248.73TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (09/2010) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMSInfrastructure of audiovisual services Communication procedures Gateway control protocol: Packages for media server control markup language and I
2、TU-T H.248 interworking Recommendation ITU-T H.248.73 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 as
3、pects H.230H.239 Communication 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 architectu
4、re for audiovisual 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 Mobil
5、e multimedia collaboration 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 p
6、rocedures H.560H.569 BROADBAND, TRIPLE-PLAY AND ADVANCED MULTIMEDIA SERVICES Broadband multimedia services over VDSL H.610H.619 Advanced multimedia services and applications H.620H.629 IPTV MULTIMEDIA SERVICES AND APPLICATIONS FOR IPTV General aspects H.700H.719 IPTV terminal devices H.720H.729 IPTV
7、 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 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T H.248.73 (09/2010) i Rec
8、ommendation ITU-T H.248.73 Gateway control protocol: Packages for media server control markup language and ITU-T H.248 interworking Summary Recommendation ITU-T H.248.73 provides guidance on mapping media server control markup language (MSCML) functions to ITU-T H.248 protocol information elements,
9、packages and procedures. It further defines a package to enable gain control (fixed and automatic) on incoming and outgoing media streams. History Edition Recommendation Approval Study Group 1.0 ITU-T H.248.73 2010-09-13 16 ii Rec. ITU-T H.248.73 (09/2010) FOREWORD The International Telecommunicatio
10、n Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questi
11、ons 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
12、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 prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, th
13、e 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 ap
14、plicability) 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 wit
15、h 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 appli
16、cability 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 not received notice of intellectual property, protected by patents, which may be required to imple
17、ment 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 2010 All rights reserved. No part of this publication may be reproduced, by any me
18、ans whatsoever, without the prior written permission of ITU. Rec. ITU-T H.248.73 (09/2010) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 2 4 Abbreviations and acronyms 2 5 Conventions 2 6 MSCML and ITU-T H.248 int
19、erworking . 2 6.1 Advanced conferencing 2 6.2 Interactive voice response (IVR) 4 6.3 Call leg events 6 6.4 Managing content . 6 6.5 Fax processing 6 6.6 MSCML response attributes and elements . 6 7 TDM Gain Control Package . 7 7.1 Properties 7 7.2 Events . 8 7.3 Signals 8 7.4 Statistics 8 7.5 Error
20、codes 9 7.6 Procedures 9 Rec. ITU-T H.248.73 (09/2010) 1 Recommendation ITU-T H.248.73 Gateway control protocol: Packages for media server control markup language and ITU-T H.248 interworking 1 Scope The media server control markup language (MSCML) is a markup language used in conjunction with sessi
21、on initiation protocol (SIP) to provide advanced conferencing and interactive voice response (IVR) functions. If used with a decomposed media server, MSCML is terminated at the media gateway controller (MGC) level as it is associated with SIP. Where the decomposed media server uses ITU-T H.248, MSCM
22、L requests need to be translated into the applicable ITU-T H.248 functionality. This Recommendation provides guidance on mapping MSCML functions to ITU-T H.248 protocol information elements, packages and procedures. Furthermore, this Recommendation defines a package to enable gain control (fixed and
23、 automatic) on incoming and outgoing streams. 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 indicated were valid. All Recommendatio
24、ns 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-T Recommendations is regularly publish
25、ed. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T G.169 Recommendation ITU-T G.169 (1999), Automatic level control devices. ITU-T H.248.1 Recommendation ITU-T H.248.1 (2005), Gateway control protocol: Version
26、 3. ITU-T H.248.2 Recommendation ITU-T H.248.2 (2005), Gateway control protocol: Facsimile, text conversation and call discrimination packages. ITU-T H.248.9 Recommendation ITU-T H.248.9 (2009), Gateway control protocol: Advanced media server packages. ITU-T H.248.19 Recommendation ITU-T H.248.19 (2
27、004), Gateway control protocol: Decomposed multipoint control unit, audio, video and data conferencing packages, plus Amendment 2 (2009), Floor control enhancements. ITU-T H.248.63 Recommendation ITU-T H.248.63 (2009), Gateway control protocol: Resource management packages. ITU-T H.248.68 Recommenda
28、tion ITU-T H.248.68 (2009), Gateway control protocol: Package for removal of digits and tones. IETF RFC 3108 IETF RFC 3108 (2001), Conventions for the use of the Session Description Protocol (SDP) for ATM Bearer Connections. IETF RFC 5022 IETF RFC 5022 (2007), Media Server Control Markup Language (M
29、SCML) and Protocol. 2 Rec. ITU-T H.248.73 (09/2010) 3 Definitions 3.1 Terms defined elsewhere None. 3.2 Terms defined in this Recommendation None. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: DTMF Dual Tone Multi-Frequency IVR Interactive Voice Resp
30、onse MG Media Gateway MGC Media Gateway Controller MSCML Media Server Control Markup Language SIP Session Initiation Protocol TDM Time Division Multiplex 5 Conventions None. 6 MSCML and ITU-T H.248 interworking This clause shows how the MSCML functions are mapped to the ITU-T H.248 elements. It cont
31、ains an analysis of the functions provided by IETF RFC 5022 and indicates how these are supported by the ITU-T H.248 sub-series of Recommendations. 6.1 Advanced conferencing 6.1.1 Conference model See clause 5.1 of IETF RFC 5022 for details. ITU-T H.248 natively supports conferencing as part of its
32、connection model. Requests for creating, modifying and deleting conference legs are translated to the appropriate ITU-T H.248 commands. 6.1.2 Configure Conference Request See clause 5.2 of IETF RFC 5022 for details. Reservedtalkers: A MGC may request Terminations for the number of talkers. The “Reso
33、urce Management Configuration Package“ defined in ITU-T H.248.63 also allows the MGC to indicate the number of speaking and listening Terminations. See Example 3 in clause 8.6.3 of ITU-T H.248.63. Reserveconfmedia: A MGC may audit a MG to determine if the MG supports signals/events/packages for reco
34、rding and/or playout. Rec. ITU-T H.248.73 (09/2010) 3 6.1.3 Configure Leg Request See clause 5.3 of IETF RFC 5022 for details. A MGC may manipulate the configuration of a conference leg by manipulating the appropriate ITU-T H.248 Descriptors on the applicable Termination. Attributes of : Type: In IT
35、U-T H.248, this is represented by the “Mode“ property, see clause 7.1.7 of ITU-T H.248.1. Dtmfclamp: This functionality may be implemented via ITU-T H.248.68. Toneclamp: This functionality may be implemented via ITU-T H.248.68. Mixmode: These mix modes can be achieved via the Topology Descriptor (cl
36、ause 7.1.18 of ITU-T H.248.1). The exception is “preferred“. The “Preferred Mix“ package in ITU-T H.248.19 allows the MGC to indicate “mix 10 loudest speakers + this one“. Inputgain, outputgain: Clause E.13 of ITU-T H.248.1 defines a gain control parameter. This contains the ability to set the gain
37、to a specific value or to auto for an outbound stream (e.g., via LocalControl). The specification of the gain per direction (incoming/outgoing) and the “startlevel“, “targetlevel“ and “silencethreshold“ is achieved through the use of the “TDM Gain Control“ package defined in this Recommendation. Cla
38、use 5.6.3.4 of IETF RFC 3108 specifies the “Gain Control“ (a=gc) attribute. This allows for directional based gain control as well as automatic gain control. However, it also does not allow the specification of the “startlevel“, “targetlevel“ and “silencethreshold“. Configure_team: ITU-T H.248 suppo
39、rts this via its connection model. Subscribe: ITU-T H.248 supports this natively via its event mechanism. 6.1.4 Terminating a conference ITU-T H.248 supports this via the Subtract command. 6.1.5 Conference manipulation See clause 5.5 of IETF RFC 5022 for details. ITU-T H.248 supports this via Add, M
40、odify and Move commands. 6.1.6 Video conferencing See clause 5.6 of IETF RFC 5022 for details. ITU-T H.248 supports this via properties in ITU-T H.248.19. 6.1.7 Conference events See clause 5.7 of IETF RFC 5022 for details. The “Speaker reporting“ package in ITU-T H.248.19 enables active talker repo
41、rting with an interval as well as the reporting of the speakers. As the MG has no concept of the call, the MGC is responsible for mapping the TerminationID to the talker called element. 4 Rec. ITU-T H.248.73 (09/2010) 6.1.8 Conferencing with personalized mixes See clause 5.8 of IETF RFC 5022 for det
42、ails. Configure_team: This is natively supported through the use of the ITU-T H.248 connection model as well as the Topology Descriptor. As mentioned, the default mix behaviour is that active talkers do not hear themselves. In order for an active talker to hear himself or herself in the mix, the “In
43、clude Participant in Mix Package“ clause 11.5 of ITU-T H.248.19 can be used. 6.2 Interactive voice response (IVR) 6.2.1 Specifying prompt content See clause 6.1 of IETF RFC 5022 for details. In general, IVR is supported by functionality in ITU-T H.248.9. For the support of the prompt attributes: Bas
44、eurl: See clause 6 of ITU-T H.248.9 for more information. Delay: Supported via the “Interval“ parameter of the Play signal in the “Advanced audio server base“ package in ITU-T H.248.9. Duration: Supported via the Signal Type “on/off“ or “timeout“ (see 7.1.11 of ITU-T H.248.1) with an associated time
45、 value. Gain: Supported by the Absolute Volume parameter in the “Advanced audio Server base“ package in ITU-T H.248.9. Gaindelta: Supported via the “Volume“ parameter of the Play signal in the “Advanced audio server base“ package in ITU-T H.248.9. Rate: Supported via the “Speed“ parameter of the Pla
46、y signal in the “Advanced audio server base“ package in ITU-T H.248.9. Ratedelta: NOTE The support via a “Playback Relative Scale Adjustment“ package is for further study. Locale: Supported via the use of variables. See clause 6 of ITU-T H.248.9. Offset: Supported by the Play signal in the “Advanced
47、 audio server base“ package, the Record signal in the “AAS recording“ package and the “Multimedia recording“ package in ITU-T H.248.9. Repeat: Supported via the “Iterations“ parameter of the Play signal in the “Advanced audio server base“ package in ITU-T H.248.9. Stoponerror: The default behaviour
48、is for an MG to generate an error response if there is a problem. The MGC may wish to retry or request further announcements. In this way, it can apply the logic associated with this. The audio element also has a number of attributes. The above mappings also apply. The variable attributes are achiev
49、ed through the use of ITU-T H.248.9 variables as described in clause 6 of ITU-T H.248.9. 6.2.2 Multimedia processing for IVR See clause 6.2 of IETF RFC 5022 for details. See ITU-T H.248.9 for multimedia support. Rec. ITU-T H.248.73 (09/2010) 5 6.2.3 Playing announcements See clause 6.3 of IETF RFC 5022 for details. Supported by the “Advanced audio server base“ package in ITU-T H.248.9. 6.2.4 Prompt and collect See clause 6.4 of IETF RFC 5
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