ITU-T E.330-1988 支持综合业务数字网(ISDN)业务的用户控制 User control of ISDN-supported services

pdf标准 ITU-T E.330-1988 支持综合业务数字网(ISDN)业务的用户控制 User control of ISDN-supported services

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ITU-T E.330-1988 支持综合业务数字网(ISDN)业务的用户控制 User control of ISDN-supported services 第 1 页 ITU-T E.330-1988 支持综合业务数字网(ISDN)业务的用户控制 User control of ISDN-supported services 第 2 页 ITU-T E.330-1988 支持综合业务数字网(ISDN)业务的用户控制 User control of ISDN-supported services 第 3 页 ITU-T E.330-1988 支持综合业务数字网(ISDN)业务的用户控制 User control of ISDN-supported services 第 4 页
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INTERNATIONAL TELECOMMUNICATION UNION )45 4 % TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU 4%,%0(/.% .%47/2+ !.$ )3$. /0%2!4)/. .5-"%2).' 2/54).' !.$ -/"),% 3%26)#% 53%2 #/.42/, /& )3$. 3500/24%$ 3%26)#%3 )45 4 Recommendation % (Extract from the "LUE "OOK) NOTES 1 ITU-T Recommendation E.330 was published in Fascicle II.2 of the Blue Book. This file is an extract from the Blue Book. While the presentation and layout of the text might be slightly different from the Blue Book version, the contents of the file are identical to the Blue Book version and copyright conditions remain unchanged (see below). 2 In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. © ITU 1988, 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 E.330 Fascicle II.2 - Rec. E.330 USER CONTROL OF ISDN-SUPPORTED SERVICES Introduction 1 This Recommendation describes the general aspects of user control of ISDN-supported services. In particular, access to the services and handling of communication sessions are treated. A service is defined as in Recommendation I.112, § 2.2. A communication session is a session between two or more telecommunication parties in which unidirectional or bidirectional communication takes place. This Recommendation primarily concerns sessions where one or more people are involved. 2 This Recommendation does not describe how to proceed in the services themselves; in fact, this Recommendation has been set up to be as service-independent as possible. 2 In stating and recommending user procedures it is important to have global information about terminal capabilities. This Recommendation, however, is drafted as terminal-independent as possible. It contains fundamental principles of user interfaces as far as these are relevant to user access to the ISDN, and does not specify terminal requirements. The CCITT, considering (a) that the ISDN will make available new services for customers and Administrations; (b) t the changeover from the present networks to the ISDN will be gradual; (c) that, from a user's point of view, private networks and public networks offer some similar services and also services that one or the other does not provide; (d) that certain services have specific user procedures and their own methods of presenting information to the user; (e) that users may benefit from uniformity in user procedures for selecting a service and for starting, switching between, and ending communications; (f) that information from the telecommunication system to the user can be sent in the form of tones, verbal announcements, or visual indications on a display; (g) that the use of terminals containing a visual display is becoming more and more common in telecommunication applications; (h) that the ISDN offer users the possibility of handling two or more connections simultaneously; (i) that handling connections simultaneously may be difficult for the user; (j) that information presentation to the user should be based on human factors considerations; (k) that terminals may be distinguishable into dedicated (service-specific) terminals and terminals with which several teleservices can be offered, recommends (1) that the methods with which communication sessions are selected, started, switched between each other and ended, should, where appropriate, make allowance for different levels of user experience; (2) that, when a similar capability using similar terminals is offered through a private network and a public network, user procedures should be similar; Fascicle II.2 - Rec. E.330 1 (3) that, where a terminal supports “higher level”1) procedures and has the same function keys used for lowerlevel procedures in other terminals, then these lower-level procedures should still be operable, to achieve the functionality reached by higher-level procedures. (4) that, on more advanced telecommunication terminals, however, other input mechanisms, having similar functions to those controlled by the function keys mentioned in (3), may replace these function keys; (5) that, for voice and non-voice services, procedures should be similar for analogous supplementary services when terminals with similar capabilities are used; (6) that tones, verbal announcements and visual indications, which are used in the existing networks should not be changed in the ISDN as long as their functions remain the same;2) . (7) that ending a communication session can be accomplished from either end, except for emergency services; (8) that it is pre

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