ITU-T F 87-1991 OPERATIONAL PRINCIPLES FOR THE TRAN R OF MESSAGES FROM TERMINALS ON THE TELEX NETWORK TO GROUP 3 FACSIMILE TERMINALS CONNECTED TO THE PUBLIC SWITCHED TELEPHONE NETW.pdf

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1、CCITT RECMNUF.87 91 48b2.591 0561283 7 INTERNAPIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMM ITTEE TELEGRAPH AND MOBILE CERVICES OPERATIONS AND QUALITY OF SERVICE Fi87 OPERATIONAL PRINCIPLES FOR THE TRANFER OF MESSAGES FROM TERMINALS ON THE TELEX NET

2、WORK TO GROUP 3 FACSIMILE TERMINALS CONNECTED TO THE PUBLIC SWITCHED TELEPHONE NETWORK Recommendation F.87 i Geneva, 1991 CCITT RECMN*F*BZ 71 4862571 0.561244 7 W INTERNATIONAL TELECOMMUN CATION UN ION CCITT F.87 THE INTERNATIONAL TELEGRAPH AND TELEPHONE CON SU LTATIVE COM M ITTEE TELEGRAPH AND MOBI

3、LE SERVICES OPERATIONS AND QUALITY OF SERVICE _ OPERATIONAL PRINCIPLES FOR THE TRANSFER OF MESSAGES FROM TERMINALS ON THE TELEX NETWORK TO GROUP 3 FACSIMILE TERMINALS CONNECTED TO THE PUBLIC SWITCHED TELEPHONE NETWORK Recommendation F.87 Geneva, 1991 CCITT RECMNxF.87 93 W 48b2593 0563285 O FOREWORD

4、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 telecommu

5、nications 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

6、down in CCITT Resolution No. 2 (Melbourne, 1988). Recommendation F.87 was prepared by Study Group I and was approved under the Resolution No. 2 procedure on the 11 of March 1991. CCIT NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunic

7、ation Administration and a recognized private operating agency. O ITU 1991 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. - CCITT R

8、ECMN*F-87 91 4862591 05bL2Bb 2 Recommendation F.87 OPERATIONAL PRINCIPLES FOR THE TRANSFER OF MESSAGES FROM TERMINALS ON THE TELEX NETWORK TO GROUP 3 FACSIMILE TERMINALS CONNECTED TO THE PUBLIC SWITCHED TELEPHONE NETWORK The CCITT, considering (a) the need to allow the transfer of messages from term

9、inals of the international telex service to Group 3 facsimile terminals on the public switched telephone network; (b) that Recommendations F.60, F.69 and other relevant Recommendations govern operation of the international telex service; (c) that Recommendation E. 163 defines the numbering plan for

10、the international telephone service; (d) that Recornmendation F.72 defines the general principles and operational aspects of international telex store and forward; (e) that Recommendations F. 160 and F. 180 define the general operational provisions for the international public facsimile services; (f

11、) that Recommendation T.4 defines the standardization of Group 3 facsimile apparatus; (9) that Recommendation T.30 defines the procedure for document facsimile transmission in the public switched telephone network; (h) that technical aspects of the international telex service are described in R-, S-

12、 and U-Series Recommendations, unanimously declares the view (1) that there are benefits in standardizing the operational procedures for a terminal of the intemational telex service to transfer a message, across international boundaries, to a Group 3 facsimile terminal on the public switched telepho

13、ne network; (2) that where this message transfer service is provided, the preferred operational procedures are laid down in this Recornmendation. 1. Scope 1.1 facsimile terminals connected to the PSTN, on a store and forward basis. The procedures defined in this Recommendation enable telex subscribe

14、rs to transfer messages to Group 3 1.2 The interworking shall be established by provision of a telex/facsimile interworking function (FAXIWF). 1.3 Bilateral agreement may be required in the event that other than normal telex service agreements are required. International access to the FAXIWF will no

15、rmally be provided via the telex network (see Figure 1F.87). 1.4 specified, with international interworking being implemented via the PSTN. See Figure 2P.87. For telex subscribers accessing a FAXIWF in their own country, national or international destinations may be Recommendation F.87 1 CCITT RECMN

16、*F.87 91 4862591 0561287 4 W Country A International boundary Country B Service bou ydary Direction of communication FIGURE 1P.87 General network configuration for interworking between terminals of the international telex service and Group 3 facsimile terminals on the PSTN International Country A bo

17、undary Service boundary terminal TO101 150-91 Country B Direction of w communication terminal TO101 160-91 FIGURE 2F.87 Network configuration for interworking between terminals of the international telex service and Group 3 facsimile terminals via the international telephone network 1.5 access. The

18、Administration providing the FAXIWF shall be responsible for any necessary barring of international 2. Service principles 2.1 The basic service offered is: - - - acceptance of messages from the telex network, with accompanying fax (PSTN) addressing information; delivery of these messages to the requ

19、ested facsimile terminal, with retries if necessary; notification message sent to the originator when the message delivery attempt fails and, optionally, when it succeeds. 2 Recommendation F.87 2.2 facsimile machine is addressed using a telex number. 2.3 A two-stage selection procedure may be used w

20、hereby a call from the telex network gains access to the FAXIWF in the first stage of selection and inputs the called address(es) and message(s) in the second stage of sclcction, aftcr the return of a call connect signal. To the extent possible, this procedure has been aligned with that for tclcx st

21、ore-and-forward facilities defined in Recornmendation F.72. A single-stage selection procedure may be used employing normal telex procedures where the requested 2.4 2.5 physical “A4” size pages as received at the fax terminal. Otherwise, the input format shall be preserved. Message input from both m

22、anual and telex automatic emitting devices should be possible. Messages deposited into the FAXIWF will be sub-divided by the FAXIWF into “pages” which serve as A page should normally comprise 55 lines of text (of 4.23 mm pitch), or part thereof for pages with fewer than 55 text lines. Upon transmiss

23、ion, it is preferred to have both message reference and pagination information inserted in a header line on each page. 2.6 optionally prepare and transmit a “header page” consisting of at least: In addition to delivering the message as pages of text to the specified fax terminal(s), the FAXIWF may -

24、 - - - - message reference information (which may include the legal time and date of acceptance); calling party identification (telex answerback and recall information, if necessary); indication of number of pages in message; specified facsimile terminal (PSTN) address; optional customcr attention i

25、nformation field (see Q 3.2.4). 2.7 indicating the calling party identification (telex answerback and recall information, if necessary). 2.8 also be provided. Where a hcader page is not transmitted, the FAXiWF should attach a herald to the beginning of the messagc Thc FAXiWF will attempt to deliver

26、the message as soon as operationally feasible. Deferred delivery may 3 Service facilities In the following section, thc symbol * indicates that the facility is not normally applicable for one-stage sclcction. 3.1 General In addition to message deposit, the following facilities may be made available:

27、 - multi-address”; - follow-on messages*; - positive delivery notification; - status enquiry requcst; - message cancel request*. Note - The multi-address facility would not normally be available to incoming international telex calls except by bilateral agreement. 3.2 Message deposit 3.2.1 called fax

28、 terminal(s) as specified by the calling party. 3.2.2 20 facsimile terminai (PSTN) addresses in a multi-address call. Validation of format and/or length should preferably be performed by the FAXIWF on the address(es) of the Where the multi-address facility is provided, the FAXIWF should be capable o

29、f accepting at least Recommendation F.87 3 CCITT RECMN*F.87 91 486259L 05bL289 8 3.2.3 An attention information field facility should be provided by the FAXIWF to enable each addressee of a multi-address message to have a relevant attention prefix preceding the message in the header page where such

30、is provided. 3.2.4 FAXIWF. For multi-address messages, a separate message reference number may be provided for each address. A message reference number shall be available to the calling party for every message accepted by the 3.2.5 The application of short-code address* and pre-recorded address list

31、s is a national matter. 3.3 Follow-on messages Provision may be made to accept follow-on message(s) with their associated address(es) which may be sent immediately after the deposit of a previous message while still retaining the connection to the FAXIWF from the originator. The procedures should be

32、 aligned with Recommendation U.43. 3.4 Status enquiry request 3.4.1 procedure used should be generally aligned with Recommendations F.72 and U.80. 3.4.2 FAXIWF. Status information on previously-deposited message shall only be returned to the message originator. The This status information should be

33、available for at least 24 hours after the time of message receipt by the 3.5 Message cancel request* If message cancellation is provided, previously deposited messages may only be cancelled by the message originator. 3.6 Deliverylnon-delivery notifcation message and journals 3.6.1 a non-delivery not

34、ification message to the originator (see 0 7.1). In the case of failure to deliver a message to the requested fax terminal, the FAXiWF shall if possible return 3.6.2 successful delivery of the message to the requested fax terminai (see Q 7.2). 3.6.3 An Administration may optionally provide a positiv

35、e delivery notification message to the originator upon The above notifications may also be provided in a summarized form (journals). 4 Access procedures 4.1 General Two basic procedures for access from a telex terminal should be provided by the FAXIWF: a) Interactive operation: - input from manual c

36、alling terminals where the TPIWF may return prompt signals; b) Non-interactive operation: - - input from telex automatic emitting devices where prompt signals may not be required; interworking with other types of interworking and conversion facilities. 4.2 One-stage selection In the one-stage select

37、ion procedure, the facsimile terminal is assigned a telex number that is part of the national telex numbering plan. 4 Recommendation F.87 4.2.1 Call establishment 4.2.1.1 The originator (or intermediary interworking or conversion facility) shall use normal telex procedures. 4.2.1.2 The telex number

38、received by the FAXIWF shall be verified as being proper to a registered facsimile terminal. Thc method of effecting this verification is a national matter. If the verification fails, the following procedures should be applied: a) where the FAXIWF is provided by the Administration which also provide

39、s all or part of the telex network, the service signal NP may be returned; b) where the FAXIWF is not provided by the Administration which also provides all or part of the telex network, the procedures to be applied shall be in accordance with Recommendation F.74. Having verified the received telex

40、number, the FAXIWF shall return the answerback allocated to the This answerback of the facsimile terminal shall be formatted in accordance with Recommendation F.74. 4.2.1.3 requcsted facsimile terminal to the originator. 4.2.1.4 4.2.1.5 In accordance with Recommendation S.23, the FAXIWF may transmit

41、 a WRU signal to the originating telex subscriber if the backward path remains idle for at least 800 milliseconds. 4.2.1.6 Having received the answerback allocated to the called facsimile terminal, the originator may input the text of his message. The FAXIWF shall respond to any received WRU signal

42、during this phase of the call by returning the answerback allocated to the facsimile terminal. 4.2.1.7 The rcaction to abnormal conditions during call Set-up shall be in accordance with normal telex procedures (sec Recornmendation U.207) ). 4.3 Two-stage selection 4.3.1 General 4.3.1.1 Calls to the

43、FAXIWF will be established by means of normal telex procedures. 4.3.1.2 The received tclcx answerback shall bc processed in accordance with Recommendation U.74 to detcrminc thc calling telex addrcss. If the answcrback is deemed to be non-processablc, the FAXIWF shall requcst input of thc calling add

44、rcss by the tclcx subscribcr by returning the ADD prompt. 4.3.1.3 Transmission from an automatic terminal is indicated by commencing the procedure with the non-intcractivc scrvicc request (characters CI). The calling terminal is recognized as interactive by the omission OE the non-interactive scrvic

45、c ruluest (CI). 4.3.1.4 If thc calling telex addrcss is capabic of being extracted from the received answerback, the FAXIWF shall rctum GA, unless a non-intcractive service request has been made. 4.3.2 Input of address(es) 4.3.2.1 For each address required, the originator should transmit the sequenc

46、e FAX + () where: FAX is the service identifier. 4.3.2.2 The address field is the only mandatory field of the address line and is the called PSTN fax address formatted in accordance with Recommendation E. 163. The address field consists of the international PSTN numbcr of the required fax terminal.

47、The end of the address field should be delimited by the end of address field signai (+), for example, P43 150145207+ 1 Recommendation U.207 has not been officially approved as of the publication date of this Recommendation F.87. Recommendation F.87 5 CCITT RECMN*F.B7 91 = 4862592 0563293 b The atten

48、tion information field is a 30-character field, delimited by parentheses, for example: (ATTN: MR.J.SMITH) The inclusion of the field is optional. If specified, the field will be inserted in the header page (see 1) 3.2.3), An example of a complete address line would be as follows: otherwise that part

49、 of the header page will be left blank. FAX 43150145207+(ATTN: MR.J.SMITH) 4.3.2.3 sequence BT. 4.3.2.4 Recommendation F.72. 4.3.2.5 input prompt (GA) unless a non-interactive service request has been received. 4.3.2.6 cleared by the FAXIWF. 4.3.2.7 The last address line shall be delimited from the message by the end of address sequencebegin text input It should be possible to mix telex, teletex and facsimile addresses in a multi-address call in accordance with Once the maximum number of permissible addresses have been input, the FAXIWF shall return the message If an end-of-addre