ITU-T H.248.29-2005 SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS Infrastructure of audiovisual services ?Communication p

pdf标准 ITU-T H.248.29-2005 SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS Infrastructure of audiovisual services ?Communication p

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INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU H.248.29 (01/2005) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS Infrastructure of audiovisual services – Communication procedures Gateway control protocol: International CAS compelled register signalling packages ITU-T Recommendation H.248.29 ITU-T H-SERIES RECOMMENDATIONS AUDIOVISUAL AND MULTIMEDIA SYSTEMS CHARACTERISTICS OF VISUAL TELEPHONE SYSTEMS INFRASTRUCTURE OF AUDIOVISUAL SERVICES General Transmission multiplexing and synchronization Systems aspects Communication procedures Coding of moving video Related systems aspects Systems and terminal equipment for audiovisual services Directory services architecture for audiovisual and multimedia services Quality of service architecture for audiovisual and multimedia services Supplementary services for multimedia MOBILITY AND COLLABORATION PROCEDURES Overview of Mobility and Collaboration, definitions, protocols and procedures Mobility for H-Series multimedia systems and services Mobile multimedia collaboration applications and services Security for mobile multimedia systems and services Security for mobile multimedia collaboration applications and services Mobility interworking procedures Mobile multimedia collaboration inter-working procedures BROADBAND AND TRIPLE-PLAY MULTIMEDIA SERVICES Broadband multimedia services over VDSL For further details, please refer to the list of ITU-T Recommendations. H.100–H.199 H.200–H.219 H.220–H.229 H.230–H.239 H.240–H.259 H.260–H.279 H.280–H.299 H.300–H.349 H.350–H.359 H.360–H.369 H.450–H.499 H.500–H.509 H.510–H.519 H.520–H.529 H.530–H.539 H.540–H.549 H.550–H.559 H.560–H.569 H.610–H.619 ITU-T Recommendation H.248.29 Gateway control protocol: International CAS compelled register signalling packages Summary The packages in this Recommendation provide H.248 support for Channel Associated Signalling (CAS) compelled register signalling. This can be used for R2, although the packages are generic so that they can also be used for other non-R2 compelled schemes. This Recommendation proposes methods to support: • standard en bloc compelling; • overlap compelling; • the ability to enable end-to-end compelled signalling. This Recommendation provides only the capabilities of compelled register signalling and it is expected that a system would need to implement the bcas, icas and casblk packages for the line signalling components of any CAS protocol. Three packages are defined in Annex A: • icasc which provides standard en bloc compelling; • icasco which extends icasc and provides overlap compelling in addition to en bloc; • icasce which extends icasco and provides the ability to enable end-to-end signalling in addition to en bloc and overlap. Annex B defines an alternative package for support of these functions, called icascgen. This package defines a generic register signalling, which may be used for national variants of Signalling System R2. This kind of interregister signalling is a compelled multifrequency code system. The package is suitable for ITU-T Signalling System R2, although it is defined in a generic way. Thus it can also be used exclusively, or in addition to the packages defined in Annex A. The proposed package comprises following compelled address transfer modes: • generic standard en bloc compelling; and • overlap procedures. NOTE – The ability to enable end-to-end compelled signalling utilizing Annex B is for further study. Annex B introduces the concepts of Detection Events Map and Generation Signals Map, which are very similar to H.248 Digit Map usage. Source ITU-T Recommendation H.248.29 was approved on 8 January 2005 by ITU-T Study Group 16 (2005-2008) under the ITU-T Recommendation A.8 procedure. ITU-T Rec. H.248.29 (01/2005) i 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

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