ITU-T E.260-1988 涉及呼叫时间测量和记录的基本技术问题 Basic technixal problems concerning the measurement and recording of call durations

pdf标准 ITU-T E.260-1988 涉及呼叫时间测量和记录的基本技术问题 Basic technixal problems concerning the measurement and recording of call durations

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ITU-T E.260-1988 涉及呼叫时间测量和记录的基本技术问题 Basic technixal problems concerning the measurement and recording of call durations 第 1 页 ITU-T E.260-1988 涉及呼叫时间测量和记录的基本技术问题 Basic technixal problems concerning the measurement and recording of call durations 第 2 页 ITU-T E.260-1988 涉及呼叫时间测量和记录的基本技术问题 Basic technixal problems concerning the measurement and recording of call durations 第 3 页 ITU-T E.260-1988 涉及呼叫时间测量和记录的基本技术问题 Basic technixal problems concerning the measurement and recording of call durations 第 4 页 ITU-T E.260-1988 涉及呼叫时间测量和记录的基本技术问题 Basic technixal problems concerning the measurement and recording of call durations 第 5 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)#% "!3)# 4%#(.)#!, 02/",%-3 #/.#%2.).' 4(% -%!352%-%.4 !.$ 2%#/2$).' /& #!,, $52!4)/.3 )45 4 Recommendation % (Extract from the "LUE "OOK) NOTES 1 ITU-T Recommendation E.260 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.260 Fascicle II.2 - Rec. E.260 BASIC TECHNICAL PROBLEMS CONCERNING THE MEASUREMENT AND RECORDING OF CALL DURATIONS 1 Recording call duration 1.1 Technically call duration is the interval that elapses between: − the moment when the clear condition is detected at the point where the recording of the call duration takes place, and − the moment when the clear condition (clear forward signal) is detected at the same point. It follows that the apparatus used to record call duration of automatic calls must be capable of detecting the two moments mentioned above and of measuring the interval between them. 1.2 When an Administration using a simplified signalling system has recourse to recording holding times for the establishment of international accounts, it is necessary to have a conversion factor making it possible to obtain the call duration from the holding time. The determination of this conversion factor requires fairly close observation. The ratio of holding time to call duration may not be the same for all the circuits of a single group, so that a fairly large number of circuits must be observed in order to find a reliable conversion factor. Moreover, the holding time also depends on the availability of switching equipment in the incoming country, as well as the reaction of subscribers when they hear ringing tone, busy tone, etc.; the holding time for a given call duration may thus be extremely variable1). 2 Discrimination between automatic and semiautomatic calls Since different accounting procedures are used for automatic and semiautomatic calls, the recording apparatus must be capable of distinguishing between these two types of calls and must record the call duration of automatic calls only. Discrimination can be effected by one of the following methods: a) by connecting the measuring apparatus to a point in the exchange through which only automatic traffic is routed; b) by recording call durations only for calls containing the discriminating digit 0 used in automatic working (see the Recommendation Q.104 cited in [2]). Method b) may be particularly useful when both automatic and semiautomatic calls originate at exchanges within the national network and are routed to the outgoing international exchange over a common group of circuits. 3 Omission of international transit traffic from the records of call duration All records of call duration will be taken in the outgoing country and will relate to calls originating in that country. It will therefore be necessary, in an international exchange which routes both terminal and international transit traffic, to exclude the call duration of international transit calls passing through the exchange. It will be difficult to discriminate between originated calls and transit calls on the outgoing international circuits and it may therefore be necessary to segregate this traffic within the exchange and connect the recording apparatus at a point in the exchange where transit traffic is not encountered. _______________ 1) In Recommendation D.150, § 4.1.4 [1] holding time is not recommended because of the wide variations between chargeable time and holding time in different relations and in different call types, which makes the use of holding time inappropriate for remunerating Administrations of countries of destination. Fascicle II.2 - Rec. E.260 1 4 Discrimination according to destination 4.1 The records of call durations obtained by the recording apparatus must be related to particular countries of destination and, if required, to the charging areas of the country of destination; the recording apparatus should therefore be capable of identifying the destination of a call and o

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