ITU-T F.420-1992 Message Handling Services: Public Interpersonal Messaging Service Study Group 1

pdf标准 ITU-T F.420-1992 Message Handling Services: Public Interpersonal Messaging Service Study Group 1

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INTERNATIONAL TELECOMMUNICATION UNION CCITT F.420 THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE MESSAGE HANDLING SERVICE OPERATIONS AND DEFINITION OF SERVICE MESSAGE HANDLING SERVICES: THE PUBLIC INTERPERSONAL MESSAGING SERVICE Recommendation F.420 (08/92) FOREWORD The CCITT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the International Telecommunication Union (ITU). CCITT 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 Plenary Assembly of CCITT which meets every four years, establishes the topics for study and approves Recommendations prepared by its Study Groups. The approval of Recommendations by the members of CCITT between Plenary Assemblies is covered by the procedure laid down in CCITT Resolution No. 2 (Melbourne, 1988). Recommendation F.420 was revised by Study Group I and was approved under the Resolution No. 2 procedure on the 4th of August 1992. ___________________ CCITT NOTES 1) In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication Administration and a recognized private operating agency. 2) A list of abbreviations used in this Recommendation can be found in Annex A. © ITU 1993 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. Recommendation F.420 Recommendation F.420 (08/92) MESSAGE HANDLING SERVICES: THE PUBLIC INTERPERSONAL MESSAGING SERVICE (revised, 1992) The establishment in various countries of message handling services in association with public networks creates the need to produce Recommendations covering the aspects of public message handling services. CONTENTS 1 Purpose and scope 2 IPM service 3 Types of body parts 4 Conversion between different encoded information types 5 Naming and addressing in general 6 Operation of the service 7 Quality of service 8 Tariff and accounting principles 9 Network requirements 10 User information and support 11 Use of the IPM service within CCITT-defined telematic services Annex A – Abbreviations Annex B – Subscriber access and terminal requirements Appendix I – Errata to Recommendations F.421 and F.422 1 Purpose and scope 1.1 General This Recommendation specifies the general, operational and quality of service aspects of the public international Interpersonal Messaging service. Interpersonal messaging services provided by Administrations belong to the group of telematic services defined in the F-Series Recommendations. This type of Message Handling service is an international telecommunication service offered by Administrations, enabling subscribers to send a message to one or more recipients and to receive messages via telecommunication networks using a combination of store-and-forward, and store-and-retrieve techniques. Locally provided functions, for which communication with other subscribers is not required, are not covered by CCITT Recommendations. The Interpersonal Messaging (IPM) service enables subscribers to request a variety of features to be performed during the handling and exchange of messages. Recommendation F.420 (08/92) 1 Some features are inherent in the basic IPM service. Other non-basic features may be selected by the subscriber, either on a per-message basis or for an agreed contractual period of time, if they are provided by Administrations. Basic features have to be made available internationally by Administrations. Non-basic features, visible to the subscriber, are classified as either essential or additional. Essential optional features must be made available internationally by Administrations. Additional optional features may be made available by some Administrations for national use and internationally on the basis of bilateral agreement. Non-basic features are called optional user facilities. IPM service may be provided using any physical network. IPM service may be offered separately or in combination with various telematic or data communication services. It can be obtained by making appropriate arrangements. Technical specifications and protocols, to be used in the IPM service, are defined in the X.400-Series Recommendations, in Recommendation T.330 and in Recommendation U.204. This service definition is contained in § 2. Requirements for intercommunication between subscribers are described in §§ 3 and 4. Section 5 describes naming and addressing, while §§ 6, 7 and 8 describe the operation of the service, quality of service, tariff and accounting principl

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