1、CCITT RECMN*F*440 92 48b259L 0574598 461 INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE MESSAGE HANDLING SERVICE OPERATIONS AND DEFINITION OF SERVICE F.440 (08/92) MESSAGE HANDLING SERVICES: THE VOICE MESSAGING SERVICE Recommendation F.44
2、0 FOREWORD The CC (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the International Telecommunication Union (ITU). CCW is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing tel
3、ecommunications on a worldwide basis. “he Plenary Assembly of CC 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 CC between Plenary Assemblies is covered by the procedure laid
4、down in CCITT Resolution No. 2 (Melbourne, 1988). Recommendation F.440 was prepared by Study Group I and was approved under the Resolution No. 2 procedure on the 4th of August 1992. In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication A
5、dministration and a recognized private operating agency. O ITU 1993 Ail rights reserved. No part of this pubiication 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. CCITT RECMN*F.44
6、0 92 W YB62591 0574600 94T Recommendation F.440 MESSAGE HANDLING SERVICES: THE VOICE MESSAGING SERVICE (I 992) CONTENTS 1 Purpose and scope 1.1 General 1.2 Message handling systems used in the provision of VM-service 2 VM-service 2.1 General service requirements 2.2 VM-service features 2.3 Responsib
7、ility boundaries 2.4 Message store 2.5 Telephone service access unit 2.6 Use of directory 2.7 Security 2.8 Distribution lists 3 Types of bo parts 3.1 Applicable body part types 3.2 Structure of voice messages 3.3 VM forwarding 4 Conversion between different encoded informution types 5 Naming and add
8、ressing in general 5.1 Directory names 5.2 O/Rnames 5.3 o/Raddresses 6 Operation of the service 6.1 General 6.2 Message handling phases 7 Qualily of service 7.1 Message status 7.2 Support by Administrations 7.3 7.4 Message delivery time targets Model of delivery and notification thes Recommendation
9、F.440 (OW21 1 CCITT RECMNxF-440 92 m 4Bb259L O574603 886 m 7.5 Delivery notifkation time targets 7.6 7.7 Error protection 7.8 Availability of service 7.9 Minimum storage capacity Receipt notifications and non-receipt notifications 8 Tariff and accounting principles 9 Network requirements 10 User inf
10、ormation and support 1 1 Annex A - Abbreviations Annex E - Subscriber access and terminal requirements Annex C - VM elements of service for 1984 systems Annex D - Classification of elements of service for Voice Messaging Annex E - Definitions of elements of service specific to Voice Messaging Annex
11、F - Classification of elements of service specific to the telephone service access unit Annex G - Secure voice messaging elements of service Annex H - Voice messaging security overview Use of the VM-service within CCiT defined telematic services 2 Recommendation F.440 (OW2) CCITT RECflNtF.440 92 486
12、2571 0574b02 712 1 Purpose and scope 1.1 General This Recommendation specifies the general, operational and quality of service aspects of the public international Voice Messaging service. Voice Messaging services provided by Administrations belong to the group of Telematic Services defined in the F-
13、Series Recommendations. This type of Message Handling (MH) service is an intemational 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
14、, and store and retrieve techniques. Locaily provided functions, for which communication with other subscribers is not required, are not covered by CCITT Recommendations. The Voice Messaging (VM) service enables subscribers to request a variety of features to be performed during the handling and exc
15、hange of voice encoded messages. Some features are inherent in the basic VM-service. Other non-basic features may be selkted by the subscriber, either on a per-message basis or for an agreed contractual period of he, if they are provided by Administrations. Intercommunication with the Interpersonal
16、Messaging (IPM) service, may be provided as an option in the VM-service. 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 in
17、ternationally 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. VM-service may be provided using any communications network.
18、VM-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 VM-service are defined in the X.400-Series Recommendations. The service defin
19、ition is contained in 5 2. Requirements for intercommunication between subscribers are described in 50 3 and 4. Naming and addressing are described in 0 5, while $5 6,7 and 8 describe the operation of the service, quality of service, tariff and accounting principles. Network requirements are given i
20、n 0 9. The provision of subscriber information is in 55 10, and 11 contains information on the use of the VM-service within CCITT defined telematic services. 1.2 Message handling systems used in the provision of VM-service 1.2.1 1984 implementations This Recommendation assumes that the message handl
21、ing systems implemented to provide the service outlined herein are based on the 1988 version of the X.4O-Series Recommendations. It is recognized however, that for some time after the publication of this Recommendation, the majority of implementations of the VM-service will be based on the 1984 X.4O
22、-Series Recommendations. Administrations are encouraged to adopt the latest CCITT Recommendations; however, in the interim, they may make use of this Recommendation with 1984 implementations as outlined below. Recommendation F.440 (OW2) 3 CCITT RECMN*F.440 92 = 4862593 0574b03 b59 1.2.2 Elements of
23、service Elements of service available for message handling services are listed and classified in Recommendation F.400. Annex C of Recommendation F.440 provides a list of all the elements of service (called service elements in 1984) for VM from Recommendation X.400 (version 1984) which are based on t
24、he IPM elements of service. Annex C of Recommendation F.400 (version 1988) lists both the elements of service in 1988 as well as changes in classification to any 1984 elements of service. Annex D of Recommendation F.400 lists the elements of service specific to the VM-service. Annex E of Recommendat
25、ion F.400 provides the definitions for the elements of service for VM additional to those described in Recommendation F.400 (1988). In all cases, 1984 elements of service may be used for the provision of the VM-service as described in this Recommendation, for a grace period ending in 1996. Administr
26、ations are urged to upgrade their implementations in this respect to the 1988 Recommendations. 1.2.3 Name forms The name forms to be used for the VM-service are consistent with those specified in the F.400 (1988) and X.400 (1988) Recommendations. 1.2.4 Interworking In order to protect the investment
27、 of Administrations who have implemented 1984 systems for the provision of VM-service, 1988, administration management domain (ADMD) implementations shall be able to interwork to 1984 ADMDs as outlined in Recommendation X.419, Annex B. Interworking from 1988 ADMDs to 1984 private management domains
28、(PRMDs) is a national matter. 2 VM-service 2.1 General service requirements 2.1.1 The fundamental abiiity of the VM-service is to provide a public interface between originators and recipients of voice communications to enhance their means of communication, especially where there is no immediate or c
29、onvenient direct telecommunication service available between subscribers equipment, or the telecommunication services available are incompatible. This service may also provide features available for the preparation and the presentation of the messages. 2.1.2 Recommendation F.410, and by systems that
30、 conform to the X.400-Series Recommendations. The VM-service will be provided by Administrations using the Message Transfer service defined in Management domains (MDs) are defined for the purpose of responsibility boundaries. The MD managed by an Administration is called an administration management
31、 domain. The MD managed by an organization is called a private management domain (PRMD). 2.1.3 CCIT standardized public data transmission services. International exchange of messages m performed between administration management domains through 2.1.4 are listed in 0 3. Different body part types of m
32、essages may be exchanged through this service. The various body part types 2.1.5 methods are: An Admiinismtion may provide subscribers with different methods of access to the VM-service. The possible 1) directly from the users terminal, e.g. telephone set; 2) via a private message handling system. N
33、ote - A voice messaging management domain may be resident in a private automatic branch exchange. 4 Recommedstion F.440 (Om) CCITT RECMNJF.440 72 4862591 0574604 595 2.1.6 Each Administration is responsible for the national access to its management domain. 2.1.7 The cbaracteristics of the interfaces
34、 and access methods used between terminals and the VM-service are a national matter, although they may follow provisions of the CCIT voice telephone service. However, the VM-service optional user facilities offered pe defined and are independent of the access method and users terminal. 2.1.8 The nat
35、ional implementation of the VM-service may provide intercommunication with existing services such as the IPM-service, teletex, facsimile and videotex. When implemented, the interfaces between the VM and the other services shall be according to relevant CCIT Recommendations. 2.1.9 As the service is p
36、roviding indirect communication, cases of non-delivery of the message to the intended recipient may occur. The VM-service provides for non-delivery notification and, as optional user facilities, for delivery, receipt and non-receipt notifications. 2.1.10 speed, access procedures, networks, and codin
37、g of message contents. Due to the intermediate storage of the message, the service may provide conversion optional user facilities: 2.1.1 1 the recipient. The message belongs to the originator until delivery has taken place. After delivery, the message belongs to 2.1.12 precedence (e.g. body type co
38、nversion or redirection control). Where sender and recipient bave different and conflicting requirements, the senders requirements shall take 2.2 VM-service features 2.2.1 Introduction Recommendation F.400, 8 19, defines elements of service which are available in the VM-service and are classified as
39、 either belonging to the basic service or as VM-optional user facilities. Elements of service comprising the basic VM-service are inherently part of the service and are always provided and available. The optional user facilities that are classified as essential are always provided and those classifi
40、ed as additional, may be available nationally, or internationally on the basis of bilateral agreement. 2.2.2 Basic W-service A set of elements of services comprises the basic VM-service. This set is defined in Recommendation F.400, and listed in Table lO/F.400. The basic VM-service, which is built u
41、pon the Message Transfer (MT) service, enables a user to send and receive voice messages. A user prepares V-messages with the assistance of his user agent (UA). User agents, which are a set of computer application processes, cooperate with each other to facilitate communication between their respect
42、ive users. To send an V-message, the originating users make a request of their UA, specifying the name or address of the recipient who is to receive the V-message. The V-message, which has an identifier conveyed with it, is then sent by the originators UA to the recipients UA via the Message Transfe
43、r service. Following a successful delivery to the recipients UA, the V-message can be received by the recipient. To facilitate meaningful communication, a receiving user may specify the encoded information type(s) that can be contained in V-messages delivered to the user, as well as the maximum leng
44、th of a message that may be delivered. The original encoded information type) and an indication of any conversions that may have been performed and the resulting encoded information type(s) are supplied with each delivered V-message. In addition, the submission time, delivery time and other capabili
45、ties are supplied with each V-message. Non-delivery notification is provided with the basic service. Recommendation F.440 (OW2) 5 CCITT RECMN*F-440 92 H 4862591 0574b0.5 421 M 2.2.3 VM optional user facilities A set of the elements of services of the VM-service are optional user facilities. The opti
46、onal user facilities of the VM-service, which may be selected on a per-message basis or for an agreed contractual period of time, are listed in Tables 11F.400 and 1uF.400, respectively. Local user facilities may be usefully provided in conjunction with some of these user facilities. The optional use
47、r facilities of the VM-service that are selected on a per-message basis are classified for both origination and reception by UAs. If an Administration provides the VM-service and offers these optional user facilities for origination by UAs, then a user is able to create and send V-messages according
48、 to the procedures defined for the associated element of service. If an Administration provides the VM-service and offers these optional user facilities for reception by UAs, then the receiving UA will be able to receive and recognize the indication associated with the corresponding element of servi
49、ce and to inform the user of the requested optional user facility. Each optional user facility is classified as additional or essential for UAs from these two perspectives. 2.2.4 Local functions The message handling system (MHS) may perform many local functions for its subscribers in addition to providing VM features. For example, to assist subscribers in preparing and editing voice messages, MHS may provide an editing capability. The MHS could alert the subscribers when new messages have arrived (for example, by setting a message light on their telephone, or by displa
