CCITT E.166(10 1992) X.122(09 1992) (英) Numbering plan interworking……

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1、INTERNATIONALTELECOMMUNICATIONUNIONCCITTTHEINTERNATIONALTELEGRAPHANDTELEPHONECONSULTATIVECOMMITTEEE.166(10/92)TELEPHONENETWORKANDISDN–OPERATION,NUMBERING,ROUTINGANDMOBILESERVICEX.122(09/92)DATACOMMUNICATIONNETWORKS:NETWORKASPECTSNUMBERINGPLANINTERWORKINGFOR

2、THEE.164ANDX.121NUMBERINGPLANSRecommendationE.166/X.122FOREWORDTheCCITT(theInternationalTelegraphandTelephoneConsultativeCommittee)isapermanentorganoftheInternationalTelecommunicationUnion(ITU).CCITTisresponsibleforstudyingtechnical,operatingandtariffquesti

3、onsandissuingRecommendationsonthemwithaviewtostandardizingtelecommunicationsonaworldwidebasis.ThePlenaryAssemblyofCCITTwhichmeetseveryfouryears,establishesthetopicsforstudyandapprovesRecommendationspreparedbyitsStudyGroups.TheapprovalofRecommendationsbythem

4、embersofCCITTbetweenPlenaryAssembliesiscoveredbytheprocedurelaiddowninCCITTResolutionNo.2(Melbourne,1988).RecommendationE.166/X.122waspreparedbyStudyGroupsIIandVIIandwasapprovedundertheResolutionNo.2procedureonthe10thofSeptember1992.___________________CCITT

5、NOTEInthisRecommendation,theexpression“Administration”isusedforconcisenesstoindicatebothatelecommunicationadministrationandarecognizedprivateoperatingagency.©ITU1993Allrightsreserved.Nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,elec

6、tronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromtheITU.RecommendationE.166/X.122RecommendationE.166(10/92)/X.122(09/92)NUMBERINGPLANINTERWORKINGFORTHEE.164ANDX.121NUMBERINGPLANS(1992)CONTENTS1Introduction2Scope3References4

7、Definitions5Abbreviations6Interworking7Interworkingdiagrams8Recommendationhistory1IntroductionDifferentpublicnetworkscurrentlymakeuseofdifferentnumberingplans.Acallfromanintegratedservicesdigitalnetwork(ISDN)toapacketswitchedpublicdatanetwork(PSPDN),aPSPDNt

8、oanISDNandcallsroutedthroughnetworksusingadifferentnumberingplanthanthatoftheoriginatingordestinationnetwork,areexamplesoftheneedtoreconcilethedifferencesthatexist.Publicswitchedtelephonenetworks(PSTNs