1、CCITT RECflN*F.89 92 m L186259L 0573795 627 m INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONS U LTATI VE COM M I TTE E TELEGRAPH AND MOBILE SERVICES OPERATIONS AND QUALITY OF SERVICE F.89 38/92) STATUS ENQUIRY FUNCTION IN THE INTERNATIONAL TELEX SERVICE Rec
2、ommendation F.89 I Geneva, 1992 - - - _ -_ -_ - - _ CCITT RECMN*Fe87 92 4862591 0573796 563 FOREWORD The CC1I” (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the International Telecommunication Union (ITU). CCIT is responsible for studying technical, opera
3、ting and tariff questions aid 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 atid approves Recommendations prepared by its Study Groups. The approval of
4、 Recommendations by the members of CCITT between Plenary Assemblies is covered by the procedure laid down in CCIT Resolution No. 2 (Melbourne, 1988). Recommendqtion F.89 was prepared by Study Group I and was approved under the Resolution No. 2 procedure on the 4th of August 1992. CCIT NOTES 1) telec
5、ommunication administration and a recognized private operating agency. 2) In this Recommendation, the expressioii “Administration” is used for conciseness to indicate both a A list of abbreviations used in this Recommendation can be found in Annex A. O ITU 1992 All rights reserved. No part of this p
6、ublication may be reproduced or utilized in any form or by any meais, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. CCITT RECMN*F.BS 92 m 4862591 0573797 4TT m Recommendation F.89 STATUS ENQUIRY FUNCTION IN THE INTERNATIONAL TELEX SERVICE
7、 (1992) 1 Introduction This Recommendation describes the facilities and operational requirements of a status enquiry function (SEF) within the internatioral telex service which enables a subscriber of the international telex service to seek and be provided with information concerning the status of a
8、 message previously deposited into an interworking function (IWF) for the purpose of transmission to a user of another service on either a store-and-fonvard basis or store-and- retrieve basis. In some interworking cases, the SEF may also provide a message cancellation facility, 2 Scope The provision
9、s of this Recommendation are limited to enquiries concerning messages handled by ,m IWF in accordance with the relevant F.80-Series Recommendations. Status enquiry in respect of messages deposited into a telex store and forward unit (SF) for delivesr to the international telex service are handled in
10、 accordance with Recommendation F.72. The provisions of this Recommendation should be applied to future implementations and, as far as possible, to existing implementations of IWF and SEU, in the latter case as alternative to the provisions of Recommendation F.72 in respect of status enquiry. 3 Area
11、 of application 3.1 on a store-aid-forward basis or store-,md-retrieve basis, namely: A status enquiry function is relevant in those interworking configurations which implement message delivery - telex to telex (see Recommendations F.72.80KJ.8 1); - - telex to teletex (see Recommendations F.8 l/F.20
12、1AJ.201); telex to facsimile Group 3 (see Recommendations F.87.207); - - - telex to iiiterpersonal messaging (IPM) (see Recommendations F.85F.421U.204); telex to videotex (see Recommendations F.86.206); telex to INMARSAT C (see Recommendations F.127AJ.208). 3.2 In the context of this Recommendation,
13、 “DELIVERED” should be interpreted in accordauce with Table 1E.89. 4 Service provided by SEF 4.1 Irforinution ubout messuge stutiis 4.1.1 The SEF should provide information about the status of messages for which message reference information had been provided at the time of message deposit in accord
14、ance with the relevant F-series Recommendations. The receipt of message reference information generally will have been effected by the use of a two-stage access, using either the input transaction accepted for delivery (ITD) or input message acknowledgement (MA) procedure. It should be noted that me
15、ssage reference information is also provided in the particular case of single-stage access from the international telex service to the INMARSAT Standard-C system in accordance with Recommendation F. 127. Recommendation F.89 (08/92) I I_ - - - - CCITT RECMN*F*87 72 48b257L 0573778 336 W Message statu
16、s information may also be provided through the use of a journal facility, which may also be applied in the single-stage access case where there may be an absence of supporting message reference information. TABLE lF.89 Definition of message “delivery” International Telex Service to: Relevant Recomme
17、ndation Message delivered to: Teletex F.81 (F.201)N.201 Memory of addressed teletex terminal Iuterpersoual messaging F.89) (F.421)/U.204 User Agent of IPM service user Videotex F.86N.206 Mailbox of videotex user Group 3 Fax F.87N.207 Group 3 facsimile terminal INMARSAT “C” F. 127N.208 MES terminal e
18、quipment Iuternational telex service F.72N.80/U.81 Destination telex terminal a) Blue Book Recommendation F.75 has been renumbered to F.85. 4.1.2 Notwithstanding the fact that the IWF may delete the text of a message after successful delivery, or after all delivery attempts have been completed, the
19、status of a message should be available to the SEF for at least 72 hours (after message acceptance. 4.1.3 The protocol to be followed between the calling telex subscriber and the SEF is described in Recommendation U.220. 4.2 Outline of status enquiryfunction 4.2.1 provided by the IW. Such a referenc
20、e should be provided on a per-message, per-address basis. In the case of two-stage IWF, a status enquiry capability can be provided when a message reference has been 4.2.2 the use of the JOURNAL or LOG facility, in both the single- and two-stage cases. Message status information may also be provided
21、 in the absence of message reference information through 1 4.3 For security reasons, status information should only be provided to the originator of the message, based on an analysis of the received answerback plus the message reference, independent of whether the answerback is processable or not (i
22、n accordance with Recommendation U.74). 4.4 The basic service features to be provided should allow for the provision of information on the stage reached in the message delivery process, as well as the ability to cancel a message. Other features may be provided on a national basis. 4.5 Access to an S
23、EF may be provided in one or both of the following ways: - - In the case of access to the IWF/SEF using a number similar to that for message deposit, provision should be made to accept the input of an address and message, for subsequent forward transmission to the addressee in the normal way, as par
24、t of a follow-on call subsequent to or in advance of a status enquiry/cmcel session. by use of an access number different to that used for message deposit; by use of an access number similar to that used for message deposit. 2 Recommendation F.89 (08/92) CCITT RECMN*F.89 92 m 4862591 0573799 272 m 4
25、.6 Access to the SEF should follow normal telex procedures and the calling telex answerback should be retrieved in accordance with Recommendation S.23. The provision of additional information by the SEF at this stage of the call should be done in accordance with the relevant U-series signalling Reco
26、mmendations. 4,7 message deposit. The procedures to be used are described in Recommendation U.220. See also Q 4.8. 4.8 prescribed in QQ 4.10 and 4.1 1 and would return the code format error (FMT) and clear the connection. 4.9 SEF should reply with the text NO MESSAGE and clear the connection. The SE
27、F should compare the received telex answerback and message reference with that provided at The SEF should not process a service request from the telex subscriber which did not follow the format Where no status information is on file for the caller, or the caller is not the originator of the message,
28、 the 4.10 Enquiry concerning message delivery 4.10.1 The calling telex subscriber should request the information by inputting the following sequence: ENQ + or ENQUIRY + where ENQ (or ENQUIRY) is the service request identifier for status information, and is the message reference assigned by the IWF a
29、t message deposit, both fields being separated by a space character. Message reference infomation may contain both alpha and numeric parts. Where the message reference information provided at message deposit consists of a date/time sequence coupled with a reference number, the input of the message r
30、eference number alone should be tolerated by the SEF. 4.10.2 replies: If a valid request has been received, the SEF should respond within three seconds with one of the following a) unessage reference information DELIVERED if message has already been successfully delivered; b unessage reference iiifo
31、rmation NOT YET DELIVERED if message delivery has not yet commenced, or is still in the retry cycle, or is in the process of being delivered: unessage reference information NOT DELIVERED if all delivery attempts have been unsuccessful; unessage reference informatiom CANCELLED if the message has alre
32、ady been cancelled. c) d) This reply should also contain, where relevant, the following details: - called address: - time of message deposit: - - - - - number of delivery attempts made; latest reason for non-delivery (e.g. NC, OCC, etc.); time of last delivery attempt (optional); time of next delive
33、ry attempt (optional); terminal identification (e.g. answerback) of the addressed terminal. The format of this information is a national matter. 4.1 1 Message cancellation procedure 4.1 1.1 The calling telex subscriber should request message cancellation by inputting the following sequence: CAN unes
34、sage reference information + or CANCEL unessage reference information + where CANCEL or CAN, is the service request identifier and UNABLE TO CANCEL if the message is contemporaueously in the process of being delivered; c) anessage reference information DELIVERED if the message has already been succe
35、ssfully delivered. 4.11.3 process of being delivered. It should be noted that it is only possible to cancel a message if it has not been delivered, or is not in the 4.12 Status enquiry or cancel in respect of severul messuges 4.12. I The procedures to be followed shall be in accordance with $9 4.10
36、and 4.1 1 in respect of each message. 4.13 Provision of journal informution 4.13.1 Having established a connection to the SEF, a calling telex subscriber may input any one of the following: JOURNAL + JOU + LOG + ENQUIRY + ENQ + In each case, the SEF should provide full information, in accordance wit
37、h 00 4.10 and 4.1 1, on all messages proper to the calling subscriber received within the previous 72 hours. Such information should be provided on a single line (69 spacing characters) per-message, per-address commencing with the latest message received. A pause of three seconds should be inserted
38、in the text stream after every five lines of status information to facilitate clearing of the connection by the originating telex subscriber. ANNEX A (to Recommendation F.89) Alphabetical list of abbreviations used in this Recommendation FMT Formaterror IMA Input message acknowledgement IPM Interpersonal messaging ITD IWF Interworking function SEF Status enquiry function SFU Store and forward unit Input transaction accepted for delivery 4 Recommendation F.89 (08/92)
