1、STDVITU-T RECMN F.472-ENGL 1997 48b2.592 0b38920 3Tb INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU F.472 SERIES F: NON-TELEPHONE TELECOMMUN SERVI CES Message handling services (08/97) CAT ON Service and operational requirements of the voice-mail store-an
2、d-forward service ITU-T Recommendation F.472 (Previously CCITT Recommendation) ITU-T F-SERIES RECOMMENDATIONS NON-TELEPHONE TELECOMMUNICATION SERVICES TELEGRAPH SERVICE Operating methods for the international public telegram service The gentex network Message switching The international telemessage
3、service The international telex service Statistics and publications on intemational telegraph services Scheduled and leased communication services Phototelegraph service Mobile services and multidestination satellite services MOBILE SERVICE TELEMATIC SERVICES Public facsimile service Teletex service
4、 Videotex service F.l-F.109 F. 1-F. 19 F.20-F.29 F.30-F.39 F.40-F.58 F.59-F.89 F.90-F.99 F.100-F.104 F.105-F.109 F. 1 10-F. 159 F. 1 10-F. 159 F. 160-F.399 F.160-F.199 F.200-F.299 F.300-F.349 General provisions for telematic services F.350-F.399 ._ -_ *- MESSAGEHANDLINGSERVICES F.kF.499 F.500-F.549
5、DIRECTORY SERVICES DOCUMENT COMMUNICATION Document communication Programming communication interfaces DATA TRANSMISSION SERVICES 1 AUDIOVISUAL SERVICES ISDN SERVICES UNIVERSAL PERSONAL TELECOMMUNICATION HUMAN FACTORS I F.550-F.599 F.550-F.579 F.580-F.599 F.600-F.699 F.700-F.799 F.800-F. 849 F.850-F.
6、899 F.900-F.999 I For further details, please refer to ITU-TList of Recommendations. STD-ITU-T RECMN F-472-ENGL 1997 W 4b2591 Ob38722 177 = ITU-T RECOMMENDATION F.472 SERVICE AND OPERATIONAL REQUIREMENTS OF THE VOICE-MAIL STORE-AND-FORWARD SERVICE Summary This Recommendation defines the general prin
7、ciples and basic operational requirements of the voice-mail store-and-forward service provided by service providers using computer-controlled voice-mail systems and Voice-mail Store-and-Forward Units (Voice SFU). Although voice-mail system access will be, predominantly, fiom within the same country
8、in which the Voice SFU is situated, this Recommendation sets out the minimum service requirements that should be fulfilled to allow international extension of the service. International extension of this service is achieved by the interconnection with one or more other Voice SFUs, across national bo
9、undaries using automated transit facilities for the purpose of transfer and delivery of voice-mail messages. Source IT-T Recommendation F.472 was prepared by ITU-T Study Group 7 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 9th of August 1997. i Recommendation F.472 (
10、08/97) STD.ITU-T RECMN F-472-ENGL 1777 D 4b257L b38723 O05 FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommuni- cations. The ITLJ Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is respo
11、nsible 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 Conference (WTSC), which meets every four years, establishes the topics for study by the
12、 ITLJ-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1. in some areas of information technology which fall within IT-Ts purview, the necessary stand
13、ards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibi
14、lity that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The 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
15、 Recommendation development process. As of the date of approval of this Recommendation, the IT hadhad not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest
16、 information and are therefore strongly urged to consult the TSB patent database. O IT 1997 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 t
17、he IT. 11 Recommendation F.472 (08/97) 1 2 3 4 5 6 7 8 9 10 CONTENTS Scope References Abbreviations . 3.1 Conventions Definitions Introduction 5.1 Interaction between the VMS and its direct user 5.2 Interaction between a Voice SFU and its direct user (i.e. VMS) 5.3 Interaction between Voice SFUs 5.4
18、 interaction between a Voice SFU and direct users of other services Service description . 6.1 Technical requirements . 6.2 Accounting and settlement 6.3 Operational aspects . 6.4 Interworking . 6.5 Message submission . 6.6 Access to the service . 6.7 Service interconnection Service elements . 7.1 Vo
19、ice message format service elements . 7.1.1 Message deferral services . 7.1.2 Voice message identification Classification of Vh4 S all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references
20、listed below. A list of the currently valid ITU-T Recommendations is regularly published. - ITU-T Recommendation F.47 1 (1 997), Operational requirements for the interconnection of voice-mail store-and- forward units. IT-T Recommendation F.400X.400 (1996), Message handling: System and service overvi
21、ew. CCITT Recommendation F.440 (1992), The voice messaging service. CCITT Recommendation X.440 (1992), Message handling systems: Voice messaging system. CCITT Recommendation G.721 (1990) (See ITU-T Recommendation G.726.) CCITT Recommendation G.726 (1990) (Has replaced former CCITT Recs. G.721 and G.
22、723), 40, 32, 24, 16 kbith Adaptive Diyerential Pulse Code Modulation (ADPCM). ITU-T Recommendation G.728 -Annex G (1994), i6 kbit/s furedpoint specijcation. - - - - - - 3 Abbreviations This Recommendation uses the following abbreviations: ADPCM DEST EOS Rec. SFU VMS VM S Multiple address message; D
23、istribution list identifier. Class of message delivery Voice-mail notifications: Successful message transfer notifications (positive Level 1); Unsuccessful message transfer notifications (negative Level 1); Successful message delivery notification (positive Level 2); Unsuccessful message delivery no
24、tification (negative Level 2). Voice encoding conversion Classification B E E A A A A B B B B A Subclause reference 7.2.1 7.2.2 7.2.2.1 7.2.2.2 7.2.2.3 7.2.3 7.2.4 7.2.4.1 7.2.4.2 7.2.4.3 7.2.4.4 7.2.5 6 Recommendation F.472 (08197) - STD-ITU-T RECMN F.472-ENGL 1997 W 4b2571 Ob38731 LB1 9 7.2.1 Acce
25、ss management Access management is the responsibility of the originating voice-mail system. It includes the identification and validation that the direct user of the voice-mail system is authorized to use its services. This may be achieved by passwords where pre-registration is involved. In cases wh
26、ere pre-registration is not employed, the identification of the originating voice-mail system may be achieved through the transfer of automatic number identification data from the access network to the Voice SFU. Where passwords are used, it should be possible for the voice-mail system to change the
27、 password periodically. The exact procedures for security of access should be a local matter. 7.2.2 Message recipient The message recipient element of service requires service providers to provide a mechanism for users to identi the intended recipient(s) for a message. The recipient identifier conve
28、ys the identity of the recipient in a routeable representation, i.e. the address, and optionally a voice signature. The method of specifjing the recipient address is a local matter. The form of this address may include an E.164 number and/or a domain component. Voice-mail messages may be addressed t
29、o a single recipient, multiple recipient or distribution list. The Voice SF supporting the originator may need to convert the canonical form of the address as created on the originating voice-mail system to one of a form used by the transit service for intercommunication between Voice SFUs. The rece
30、iving Voice SFU may need to convert the received address into the canonical form used by the voice-mail system. in such cases, the recipient address as created in the originating voice-mail system shall be preserved and returned in any notifications related to the subject message. 7.2.2.1 Single add
31、ress message A single address message is a message with one recipient address and optionally as voice signature. 7.2.2.2 Multiple address message A multiple address message is a message which is addressed to more than one recipient. VM S b) routine. The process by which the class of message delivery
32、 is selected should be a local matter. Qualiv of service objectives for the above classes of delivery are shown in 10.2, Table 3. 7.2.4 Voice-mail notifications Message status information is exchanged in VM S or the notification may be automatically generated after the VMS associated with the receiv
33、ing Voice SFU has accepted responsibility for the subject message based on some locally determined criteria. Successful message transfer notification (positive Level 1 notification) 0 In either case, it conveys the semantics that responsibility for the message has been transferred to the receiving V
34、oice SFU. Level 1 successful transfer notifications shall provide at least the following information: 0 message reference; 0 recipient address; o NOTE - Provision of time zone indication is a local matter although UTC is recomended. time of delivev to recipient address. 7.2.4.2 The unsuccessful mess
35、age transfer notification reports to the originator the failure to transfer a message to the receiving Voice SFU associated with an intended recipient. This notification is automatically generated by the service if the Voice SFW fails to accept responsibility for the subject message. Depending upon
36、the message acceptance policy of the receiving VMS: 1) the notification may be automatically generated immediately on message delivev by the rejecting Voice SF (and its associated transfer system) on behalf of its associated VMS based on some locally determined criteria; or the notification may be a
37、utomatically generated after the VMS associated with the receiving Voice SF signals non-acceptance of responsibility for the subject message based on some locally determined criteria. Unsuccessful message transfer notification (negative Level 1 notification) 2) Level 1 unsuccessful delivery notifica
38、tions shall provide at least the following information: 0 message identification; 0 notification originator identification; 0 0 NOTE 1 - Provision of time zone indication is a local matter, although UTC is recommended. NOTE 2 - Unsuccessful message transfer notifications do not need to be requested
39、by the originator because the service always generates one on a per recipient basis if delivery to the destination Voice SFU fails. NOTE 3 - The service is provided by the transfer system associated with the destination Voice SFU. original message recipient indication (as submitted by the originator
40、); date and time of failure; failure reason and diagnostic information. 7.2.4.3 A successful message delivery notification reports to the originator the services success in delivering a message from the Voice SFU to the voice-mail system which serves the intended recipient as further qualified in 7.
41、2.2E.471. This notification is only generated if requested by the originator. The report to the service may provide at Least the following information: 0 message identification; 0 notification originator identification; original intended message recipient; Successful message delivery notification (p
42、ositive Level 2 notification) receiving terminal identification; 8 Recommendation F.472 (08/97) STD-ITU-T RECMN F-472-ENGL 1997 D qBb.2591 b38933 T54 0 message duration; 0 delivery duration; 0 NOTE 1 - Provision of time zone indication is a local matter although UTC is recommended. NOTE 2 -Receiving
43、 terminal identification, message duration, and delivery duration are as defined in Recommendation F.440. date and time of responsibility acceptance. 7.2.4.4 Unsuccessful message delivery notification (negative Level 2 notification) A negative message acceptance notification reports to the originato
44、r the failure to deliver a message from the Voice SFU to the voice-mail system which serves the intended recipient. The notification is always generated by the Voice SFU whenever the destination VMS fails to accept responsibility for the subject message. The local message acceptance policy is used t
45、o determine the basis for the rejection. For example, possible reasons for not accepting responsibility for the message is the messages address does not actually identi a user of that VMS, or the voice-mail system cannot place the message into the recipients mailbox, e.g. box full or locked, or the
46、message is forwarded to another user, etc. Level 2 notifications shall provide at least the following information: 0 message identification; 0 notification originator identification; 0 original intended message recipient (as submitted by the originator); 0 date and time of failure; o failure reason
47、and diagnostic information; 0 time last attempted; number of attempts; 0 delivered message duration. NOTE 1 - Provision of time zone indication is a local matter, although UTC is recommended. NOTE 2 - Negative Level 2 notifications do not need to be requested by the originator because the service al
48、ways generates one on a per recipient basis if delivery to the destination Voice SFU fails. NOTE 3 - Time last attempted, number of attempts, and delivered message duration are as defined in Recommendation F.440. 7.2.5 Voice message encoding conversion The conversation service facility enables-a mes
49、sage to be converted from one speech encoding to another, e.g. G.711 toG.726 conversion. If a Voice SFU supports speech encoding other than 32K ADPCM defined in Recommen- dation G.726, then it shall support conversion between Recommendation G.726 and that format. The conversion should be an automatic faciliy and should not require additional procedures for users. NOTE - Some conversions may result in a loss of information and degrade intelligibility of the message. Such conversions should be avoided. For example, Recommendation (3.728 (16K LD-CELP) to G.726 (32K ADPCM
