1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 1 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU).4%27/2+).G0G0/&G0G03).!,).G0G03934%-3).4%27/2+).G0G0/&G0G03).!,).G0G03934%-3G0G0G13%6%.43)45G134G0G0RecommendationG0G01 (Extract from the “LUEG0“OOK)NOTES1 ITU-T Recommendation Q.603 was published in Fascic
2、le VI.6 of the Blue Book. This file is an extract fromthe Blue Book. While the presentation and layout of the text might be slightly different from the Blue Book version, thecontents of the file are identical to the Blue Book version and copyright conditions remain unchanged (see below).2 In this Re
3、commendation, the expression “Administration” is used for conciseness to indicate both atelecommunication administration and a recognized operating agency. ITU 1988, 1993All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic ormechanica
4、l, including photocopying and microfilm, without permission in writing from the ITU.Fascicle VI.6 - Rec. Q.603 1Recommendation Q.603Fascicle VI.6 - Rec. Q.6033 EVENTSAll information transfer between incoming and outgoing signalling systems logic procedures occurs as events.These events are represent
5、ed as FITEs, BITEs and activation signals. In addition, SPITEs are used internally.The translation of the information content of a signal into its corresponding interworking telephone event mustnot lead to a change of its information content, i.e. the information content must be translated only into
6、 one singleinterworking telephone event.Tables A-l to A-31)list all of the forward interworking telephone events (FITEs), backward interworkingtelephone events (BITEs) and switching processing interface telephone events (SPITEs).There are some events which are the direct result of signals received i
7、n some particular call phase. These eventsperform the transfer of signalling information. However not all signals directly generate interworking events.There are some events which are the result of signals in a particular call phase and internal logic procedures.This applies particularly to routing,
8、 country code indications and echo-suppressor control.There are some events (e.g. due to time-outs) which are purely the result of internal interworking logicprocedures. In addition, it may be useful to consider the internal procedures of the various signalling systems, which donot generate interwor
9、king events.In using the events approach the following rules are observed:a) In generating events all the circumstances under which the event may arise are examined so that the eventdescription is exact.b) All events which have been identified by considering the response of a signalling system to events areincluded in Tables A-l to A-3._1)See Annex A to Recommendations Q.601-Q.608.
