1、INTERNATIONAL TELECOMMUNICATION UNIONITU-TE.166/X.122TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU(03/98)SERIES E: TELEPHONE NETWORK AND ISDNOperation, numbering, routing and mobile services International operation Numbering plan of theinternational telephone serviceSERIES X: DATA NETWORKS AND OPEN
2、SYSTEMCOMMUNICATIONPublic data networks Network aspectsNumbering plan interworking for the E.164 andX.121 numbering plansITU-T Recommendation E.166/X.122(Previously CCITT Recommendation)ITU-T E-SERIES RECOMMENDATIONSTELEPHONE NETWORK AND ISDNFor further details, please refer to ITU-T List of Recomme
3、ndations.OPERATION, NUMBERING, ROUTING AND MOBILE SERVICESINTERNATIONAL OPERATION E.100E.229Definitions E.100E.103General provisions concerning Administrations E.104E.119General provisions concerning users E.120E.139Operation of international telephone services E.140E.159Numbering plan of the intern
4、ational telephone service E.160E.169International routing plan E.170E.179Tones in national signalling systems E.180E.199Maritime mobile service and public land mobile service E.200E.229OPERATIONAL PROVISIONS RELATING TO CHARGING AND ACCOUNTING INTHE INTERNATIONAL TELEPHONE SERVICEE.230E.299Charging
5、in the international telephone service E.230E.249Procedures for remuneration of Administrations for facilities made available E.250E.259Measuring and recording call durations for accounting purposes E.260E.269Establishment and exchange of international accounts E.270E.299UTILIZATION OF THE INTERNATI
6、ONAL TELEPHONE NETWORK FOR NON-TELEPHONY APPLICATIONSE.300E.329General E.300E.319Phototelegraphy E.320E.329ISDN PROVISIONS CONCERNING USERS E.330E.399QUALITY OF SERVICE, NETWORK MANAGEMENT AND TRAFFIC ENGINEERINGNETWORK MANAGEMENT E.400E.489TRAFFIC ENGINEERING E.490E.799QUALITY OF TELECOMMUNICATION
7、SERVICES: CONCEPTS, MODELS,OBJECTIVES AND DEPENDABILITY PLANNINGE.800E.899ITU-T RECOMMENDATION E.166/X.122NUMBERING PLAN INTERWORKING FOR THE E.164 AND X.121 NUMBERING PLANSSummaryThis Recommendation defines the procedures applicable for the purpose of numbering planinterworking between networks whi
8、ch use the E.164 numbering plan and networks which use theX.121 numbering plan. The principles for interworking between the E.164 and X.121 numberingplans covered in this Recommendation are illustrated by various examples of packet mode calls.Although both the escape code method and the Numbering Pl
9、an Identifier (NPI) method aredescribed, the recommended solution is use of the NPI method.SourceITU-T Recommendation E.166/X.122 was revised by ITU-T Study Groups 2 and 7 (1993-1996) andwas approved under the WTSC Resolution No. 1 procedure on the 8th of October 1996.Due to some legibility problems
10、, a new version was output on the 18th of March 1998 with enhancedfigures, but without any content or editorial modification.ii Recommendation E.166/X.122 (03/98)FOREWORDITU (International Telecommunication Union) is the United Nations Specialized Agency in the field oftelecommunications. The ITU Te
11、lecommunication Standardization Sector (ITU-T) is a permanent organ ofthe ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuingRecommendations on them with a view to standardizing telecommunications on a worldwide basis.The World Telecommunication Standardi
12、zation Conference (WTSC), which meets every four years,establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendationson these topics.The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down inWTSC Resolution No. 1 (He
13、lsinki, March 1-12, 1993).In some areas of information technology which fall within ITU-Ts purview, the necessary standards areprepared on a collaborative basis with ISO and IEC.NOTEIn this Recommendation, the expression “Administration” is used for conciseness to indicate both atelecommunication ad
14、ministration and a recognized operating agency. ITU 1998All 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.166/X.122 (03
15、/98) iiiCONTENTSPage1 Introduction 12 Scope 13 References 24 Definitions 35 Abbreviations . 46 Interworking . 46.1 Numbering plans 46.1.1 Escape codes . 46.1.2 Prefixes 56.1.3 Allocation of a DNIC to an ISDN or PSTN 56.2 Methods56.2.1 Dial-in method 56.2.2 Escape code method 66.2.3 NPI method . 66.3
16、 Subscriber dialling procedures . 66.3.1 Single stage dialling 66.3.2 Double stage dialling. 76.4 Escape code method versus NPI method 76.5 Reconciliation between the escape code method and the NPI method 86.6 Internetwork implementation . 96.7 Man-machine interface procedures 97 Interworking diagra
17、ms 97.1 Conventions used in the interworking diagrams (Figures 2 through 28). 97.2 Index of interworking diagrams . 107.2.1 Section A: Scenarios for interworking 107.2.2 Section B: Bearer capability interworking that requires no numbering planinterworking 107.2.3 Section C: Numbering plan interworki
18、ng . 117.2.4 Section D: Interworking with terminals that have dual numbers 117.3 Interworking diagrams 128 Recommendation history 40Recommendation E.166/X.122 (03/98) 1Recommendation E.166/X.122NUMBERING PLAN INTERWORKING FOR THE E.164AND X.121 NUMBERING PLANS(revised in 1996)1 IntroductionVarious p
19、ublic networks such as Integrated Services Digital Networks (ISDNs) and Public SwitchedTelephone Networks (PSTNs) utilize the E.164 numbering plan, whilst Packet Switched Public DataNetworks (PSPDNs) are generally numbered under the X.121 numbering plan. A call from an ISDN(or PSTN) to a PSPDN, a PS
20、PDN to an ISDN and calls routed through networks using a differentnumbering plan to that of the originating or destination network are examples of the need fornumbering plan interworking. Numbering plan interworking is a fundamental requirement for thesuccessful completion of calls between networks
21、utilizing different numbering plans.This Recommendation defines the general procedures applicable to numbering plan interworkingbetween: ISDNs and PSPDNs; ISDNs and PSTNs; and PSPDNs and PSTNs.The numbering and addressing principles for PSTNs/ISDNs are described in Recommendation I.330.The numbering
22、 principles for public data networks are defined in Recommendation X.121.2 Scope2.1 The scope of this Recommendation is to define the procedures applicable for the purpose ofnumbering plan interworking between networks which use the E.164 numbering plan and networkswhich use the X.121 numbering plan
23、.2.2 Although both the E.164 and X.121 numbering plans accommodate both circuit switchedand packet switched networks, the principles for interworking between the E.164 and X.121numbering plans covered in this Recommendation are illustrated by various examples which involveonly packet mode calls. Alt
24、hough not illustrated, the numbering plan interworking principles, usingthe Numbering Plan Identifier (NPI) method are also applicable to frame relay networks.2.3 Interworking involving two or more networks is included in the scope of thisRecommendation.2.4 This Recommendation applies to numbering p
25、lan interworking across internationalboundaries. Its applicability to calls within a single country is a national matter.2.5 The sample call flows shown in the figures are from terminal to terminal. For thosesituations that involve escape codes, it should be noted that the interworking arrangements
26、within anational network are a national matter.2.6 The application of this Recommendation includes the following numbering planinterworking and bearer capability interworking scenarios:a) calls from/to a speech terminal on an ISDN, to/from a voice terminal on a PSTN (see Figures2 and 3);2 Recommenda
27、tion E.166/X.122 (03/98)b) calls from/to an X.25 terminal on an ISDN, to/from an X.25 terminal using X.32 procedureson a PSTN (see Figures 4 and 5);c) calls from/to an X.25 terminal on an ISDN, to/from an X.25 terminal on another ISDN (seeFigure 6);d) calls from/to an X.25 terminal on a PSPDN, to/fr
28、om an X.25 terminal using X.32 procedureson a PSTN (see Figures 7, 8, 27 and 28);e) calls from/to an X.25 terminal on a PSPDN, to/from an X.25 terminal using X.31 procedures(BC = PS) on an ISDN (see Figures 11 and 12);f) calls from/to an X.25 terminal on a PSPDN utilizing an ISDN packet switch as a
29、transitnetwork for calls to/from an X.25 terminal on a PSPDN (see Figure 13);g) calls from/to an X.25 terminal using X.31 procedures (BC = PS) on an ISDN utilizing aPSPDN as a transit network for calls to/from an X.25 terminal using X.31 procedures(BC = PS) on another ISDN (see Figure 16);h) calls f
30、rom/to an X.25 terminal using X.31 procedures (BC = PS) on an ISDN utilizing aPSPDN as a transit network for calls to/from an X.25 terminal using X.31 procedures(BC = 64) on another ISDN (see Figures 14, 15, 17 and 18);i) calls from/to an X.25 terminal using X.31 procedures (BC = PS) on an ISDN util
31、izing aPSPDN as a transit network for calls to/from an X.25 terminal using X.32 procedures on aPSTN (see Figures 19, 20, 21 and 22);j) calls from/to an X.25 terminal using X.31 procedures (BC = PS) on an ISDN utilizing aPSPDN and an ISDN packet switch as transit networks for calls to/from an X.25 te
32、rminalusing X.32 procedures on a PSTN (see Figures 23 and 24);k) calls from/to an X.25 terminal on a PSPDN to/from an X.25 terminal using X.31 procedures(BC = 64) on an ISDN (see Figures 9, 10, 25 and 26).NOTE None of the scenarios listed above specifically address character mode Data Terminal Equip
33、ment(DTE) (i.e. X.28 mode) access to a Packet Assembly/Disassembly (PAD) nor Group 3 FAX (i.e. X.38 mode)access to a Facsimile Packet Assembly/Disassembly (FPAD). The escape code method scenarios for X.25terminals are in most cases applicable to X.28 and/or X.38 terminals. However, this is not the c
34、ase for theNPI method scenarios until a Numbering Plan Identifier (NPI)-like facility is defined in RecommendationsX.28 and/or X.38.3 References3.1 This Recommendation is related to and is compatible with the following Recommendations: ITU-T Recommendation E.160 (1993), Definitions relating to natio
35、nal and internationalnumbering plans. CCITT Recommendation E.164 (I.331) (1991), Numbering plan for the ISDN era. CCITT Recommendation E.165 (1988), Timetable for coordinated implementation of thefull capability of the numbering plan for the ISDN era (Recommendation E.164). ITU-T Recommendation E.16
36、5.1 (1996), The use of escape code “0“ within the E.164numbering plan during the transition period to implementation of NPI mechanism. CCITT Recommendation E.170 (1992), Traffic routing. CCITT Recommendation E.172 (1992), ISDN routing plan.Recommendation E.166/X.122 (03/98) 3 CCITT Recommendation E.
37、173 (1991), Routing plan for interconnection between publicland mobile networks and fixed terminal networks. CCITT Recommendation I.330 (1988), ISDN numbering and addressing principles. ITU-T Recommendations Q.761 to Q.764 (1993), Integrated services digital network userpart. ITU-T Recommendation Q.
38、931 (1993), ISDN user-network interface layer 3 specificationfor basic call control. ITU-T Recommendation X.25 (1996), Interface between Data Terminal Equipment (DTE)and Data Circuit-terminating Equipment (DCE) for terminals operating in the packet modeand connected to public data networks by dedica
39、ted circuit. ITU-T Recommendation X.28 (1993), DTE/DCE interface for start-stop mode data terminalequipment accessing the packet assembly/disassembly facility (PAD) in a public datanetwork situated in the same country. ITU-T Recommendation X.31 (1995), Support of packet mode terminal equipment by an
40、ISDN. ITU-T Recommendation X.32 (1996), Interface between Data Terminal Equipment (DTE)and Data Circuit-terminating Equipment (DCE) for terminals operating in the packet modeand accessing a packet switched public data network through a public switched telephonenetwork or an integrated services digit
41、al network or a circuit switched public data network. ITU-T Recommendation X.38 (1996), G3 facsimile equipment/DCE interface for G3facsimile equipment accessing the Facsimile Packet Assembly/Disassembly facility (FPAD)in a public data network situated in the same country. ITU-T Recommendation X.75 (
42、1993), Packet-switched signalling system between publicnetworks providing data transmission services. CCITT Recommendation X.110 (1988), International routing principles and routing planfor public data networks. ITU-T Recommendation X.121 (1996), International numbering plan for public datanetworks.
43、 ITU-T Recommendation X.123 (1996), Mapping between escape codes and TOA/NPI forE.164/X.121 numbering plan interworking during the transition period. CCITT Recommendation X.300 (1988), General principles for interworking between publicnetworks and between public networks, and other networks for the
44、provision of datatransmission services. ITU-T Recommendation X.301 (1993), Description of general arrangements for call controlwithin a subnetwork and between subnetworks for the provision of data transmissionservices.4 DefinitionsWithin the integrated service and dedicated network environment, the
45、terms used for all networksand services must be compatible and consistent. A list of terms and their definitions relating tonumbering are contained in Recommendations E.160, E.164, and X.121. Additionally, theapplication of some of the definitions is found in clause 6.4 Recommendation E.166/X.122 (0
46、3/98)5 AbbreviationsThe following abbreviations are used within this Recommendation:64 64 kbits/sAF Address FieldAU Access UnitBC Bearer CapabilityCRP Call Request PacketCS Circuit SwitchedDCE Data Circuit-terminating EquipmentDNIC Data Network Identification CodeDTE Data Terminal EquipmentEC Escape
47、 CodeFPAD Facsimile Packet Assembly/DisassemblyICP Incoming Call PacketISDN Integrated Services Digital NetworkNPI Numbering Plan IdentifierONSD Optional Network-Specific DigitPAD Packet Assembly/DisassemblyPDN Public Data NetworkPH Packet HandlerPS Packet SwitchedPSPDN Packet Switched Public Data N
48、etworkPSTN Public Switched Telephone NetworkROA Recognized Operating AgencySS No. 7 Signalling System No. 76 Interworking6.1 Numbering plansThe two numbering plans included in the arrangements shown in this Recommendation are the E.164and the X.121 numbering plans. It is strongly suggested that a re
49、ader who wishes to obtain maximumbenefit from this Recommendation be familiar with the provisions of the indicated numbering planRecommendations.6.1.1 Escape codesAn escape code is an indicator consisting of one or more digits which is defined in a givennumbering plan and is used to indicate that the address digits that follow it are from a specificnumbering plan different from the given numbering plan. The Escape Codes (ECs) discussed in thisRecommendation are one digit in length.Recommendation E.166/X.122 (03/98) 5An escape
