1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T E.123 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (02/2001) SERIES E: OVERALL NETWORK OPERATION, TELEPHONE SERVICE, SERVICE OPERATION AND HUMAN FACTORS International operation General provisions concerning users Notation for national and international
2、 telephone numbers, e-mail addresses and Web addresses ITU-T Recommendation E.123 (Formerly CCITT Recommendation) ITU-T E-SERIES RECOMMENDATIONS OVERALL NETWORK OPERATION, TELEPHONE SERVICE, SERVICE OPERATION AND HUMAN FACTORS INTERNATIONAL OPERATION Definitions E.100E.103 General provisions concern
3、ing Administrations E.104E.119 General provisions concerning users E.120E.139 Operation of international telephone services E.140E.159 Numbering plan of the international telephone service E.160E.169 International routing plan E.170E.179 Tones in national signalling systems E.180E.189 Numbering plan
4、 of the international telephone service E.190E.199 Maritime mobile service and public land mobile service E.200E.229 OPERATIONAL PROVISIONS RELATING TO CHARGING AND ACCOUNTING IN THE INTERNATIONAL TELEPHONE SERVICE Charging in the international telephone service E.230E.249 Measuring and recording ca
5、ll durations for accounting purposes E.260E.269 UTILIZATION OF THE INTERNATIONAL TELEPHONE NETWORK FOR NON-TELEPHONY APPLICATIONS General E.300E.319 Phototelegraphy E.320E.329 ISDN PROVISIONS CONCERNING USERS E.330E.349 INTERNATIONAL ROUTING PLAN E.350E.399 NETWORK MANAGEMENT International service s
6、tatistics E.400E.409 International network management E.410E.419 Checking the quality of the international telephone service E.420E.489 TRAFFIC ENGINEERING Measurement and recording of traffic E.490E.505 Forecasting of traffic E.506E.509 Determination of the number of circuits in manual operation E.
7、510E.519 Determination of the number of circuits in automatic and semi-automatic operation E.520E.539 Grade of service E.540E.599 Definitions E.600E.649 Traffic engineering for IP-networks E.650E.699 ISDN traffic engineering E.700E.749 Mobile network traffic engineering E.750E.799 QUALITY OF TELECOM
8、MUNICATION SERVICES: CONCEPTS, MODELS, OBJECTIVES AND DEPENDABILITY PLANNING Terms and definitions related to the quality of telecommunication services E.800E.809 Models for telecommunication services E.810E.844 Objectives for quality of service and related concepts of telecommunication services E.8
9、45E.859 Use of quality of service objectives for planning of telecommunication networks E.860E.879 Field data collection and evaluation on the performance of equipment, networks and services E.880E.899 For further details, please refer to the list of ITU-T Recommendations. ITU-T E.123 (02/2001) i IT
10、U-T Recommendation E.123 Notation for national and international telephone numbers, e-mail addresses and Web addresses Summary This Recommendation applies specifically to the printing of national and international telephone numbers, electronic mail addresses and Web addresses on letterheads, busines
11、s cards, bills, etc. Regard has been given to the printing of existing telephone directories. The standard notation for printing telephone numbers, E-mail addresses and Web addresses helps to reduce difficulties and errors, since this address information must be entered exactly to be effective. Sour
12、ce ITU-T Recommendation E.123 was revised by ITU-T Study Group 2 (2001-2004) and approved under the WTSA Resolution 1 procedure on 2 February 2001. ii ITU-T E.123 (02/2001) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunica
13、tions. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunicati
14、on Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of inf
15、ormation technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating ag
16、ency. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property
17、 Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implem
18、entors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2001 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photoc
19、opying and microfilm, without permission in writing from ITU. ITU-T E.123 (02/2001) iii CONTENTS Page 1 General 1 2 Notation for National and International Telephone Numbers 1 3 Notation for Electronic Mail Addresses . 2 4 Notation for Web Addresses. 2 5 Classes of symbols 2 6 Diallable symbols . 3
20、7 Procedural symbols. 3 7.1 International prefix symbol. 3 7.2 Use of parentheses 3 7.3 Multiple numbers reached through automatic search . 3 7.4 Multiple numbers without automatic search. 4 7.5 In-dialling 4 7.6 Symbol to indicate the existence of an additional dial tone . 4 8 Information symbols .
21、 5 9 Spacing symbols . 5 10 Facsimile number notation 5 Annex A . 6 Desirable properties of diallable symbols 6 A.1 Distinct from other diallable symbols. 6 A.2 Widely known name . 6 A.3 Reproducible. 6 A.4 ITU-T-ISO compatible . 6 A.5 Made up of a single character . 6 A.6 Abstract. 6 A.7 Immediatel
22、y recognizable as a diallable character . 6 ITU-T E.123 (02/2001) 1 ITU-T Recommendation E.123 Notation for national and international telephone numbers, e-mail addresses and Web addresses 1 General The statements below apply specifically to the printing of national and international telephone numbe
23、rs, electronic mail addresses and Web addresses on letterheads, business cards, bills, etc. Regard has been given to the printing of existing telephone directories. The standard notation for printing telephone numbers, e-mail addresses and Web addresses helps to reduce difficulties and errors, since
24、 this address information must be entered exactly to be effective1. 2 Notation for National and International Telephone Numbers 2.1 The international number should be printed below the national number, with corresponding digits lined up one under the other to facilitate understanding of the composit
25、ion of the international number as shown in the examples in 2.3 and 2.4 below. 2.2 The words “National“ and “International“ in the appropriate language should be placed to the left of the national and international numbers, and these should be separated by a horizontal line. 2.3 Either the symbol fo
26、r telephone given in ITU-T E.121 or the word “Telephone“ in the appropriate language should be placed to the left of (or above) the national and international numbers (to avoid confusion with other letterhead numbers). The + (plus) signifies the international prefix (see 7.1). Example: Telephone 456
27、7 123 607 22 nalInternatio4567 123 (607) National+(Additional examples are shown in clause 6 below.) 2.4 Because the countries of World Numbering Zone 1 (North America) have the country code 1, the same number as is used for the trunk prefix, and because dialling between these countries is the same
28、as long-distance dialling within them, subscriber difficulties are avoided by using an alternative notation that has been found superior for use within these countries and equally good for subscribers in other countries dialling to Zone 1. This is to substitute for “National“ on the upper line the p
29、hrase “Within N. Amer. zone“. Example: Telephone 45671233021 nalInternatio4567123(302) zone Amer. N.Within +2.5 If it is desirable to write only the international number, it should be written in the form: Telephone International +22 607 123 4567 2.6 If it is desirable, for example, to save space to
30、accommodate printing several different numbers for FAX, mobile, etc. as well as an ordinary telephone number, each number should be printed as a short label (e.g., “Tel“) followed by the number in the desired domestic or international format. The domestic format should be the same as used on the top
31、 line shown in 2.3, and the international format should be that shown on the bottom line in the same paragraph, but omitting the words “National“ or “International“ in each case. Example 1: Tel. (0607) 123 4567 _ 1It is also desirable that the printing of other information on letterheads, etc. such
32、as telex and telegraph numbers and postal codes should not cause subscriber confusion with the telephone number. 2 ITU-T E.123 (02/2001) Fax (0607) 123 4568 Mobile (0607) 321 9876 Example 2: Tel. +22 607 123 4567 Fax +22 607 123 4568 Mobile +22 607 321 9876 2.7 To show an extension number of a PABX
33、without direct in-dialling, the nationally used word or abbreviation for “extension“ should be written immediately after the telephone numbers and on the same line as the word “telephone“, followed by the extension number itself. Example 1: Telephone 45671233021 nalInternatio4567123(302) zone Amer.
34、N.Within +ext. 876 Example 2: Telephone international +22 607 123 4567 ext. 876 In this way, the extension number is separated from the digits to be dialled and, where it must be typed onto a letterhead, for example, it need be typed only once. 2.8 It is often necessary to draw the attention of subs
35、cribers to the need to omit the foreign national trunk prefix when dialling an international call. This need occurs when the destination country conventionally writes its telephone numbers such that the trunk prefix appears with the trunk code (in parentheses). To compose a comprehensible and accura
36、te statement can prove difficult: suitable forms are given in 3.2/E.122. 2.9 Grouping the digits of a telephone number is advisable for reasons of memorizing, oral presentation, and printing. 3 Notation for Electronic Mail Addresses 3.1 An electronic mail address, if present, should be printed in th
37、e SMTP style below the telephone number information, and denoted by the label “E-mail“ or some easily recognized variation such as “email,“ or the equivalent in the appropriate language. Example: Telephone: National (0609) 123 4567International +22 609 123 4567E-mail: 3.2 If necessary to save space,
38、 it is permissible to omit the label “E-mail.“ 4 Notation for Web Addresses 4.1 A Web address, if present, should be printed without the prefix http:/ near the e-mail address information, and denoted by the label “Web“ or the equivalent in the appropriate language. Example: Telephone: National (0609
39、) 123 4567International +22 609 123 4567E-mail: Web: 5 Classes of symbols 5.1 There are four classes of symbols in national or international numbers. No symbol should be used in more than one class, nor should any symbol within a class have more than one meaning. ITU-T E.123 (02/2001) 3 5.2 These cl
40、asses are: diallable symbols (in French: symboles servant la composition du numro); procedural symbols (in French: symboles opratoires); information symbols (in French: symboles dinformation); spacing symbols (in French: symboles despacement). 6 Diallable symbols A diallable symbol is a symbol which
41、 is to be dialled and appears on a telephone set to designate either a finger hole of a dial or a push button of a keyset2. These symbols can be digits, letters, or other signs. Some desirable properties to be considered when selecting diallable symbols are listed in Annex A. 7 Procedural symbols A
42、procedural symbol is a symbol which tells the subscriber how to dial. Such symbols should not appear in a finger hole or on a push button because they are not to be dialled. 7.1 International prefix symbol The international prefix symbol should be + (plus) and should precede the country code in the
43、international number. It serves to remind the subscriber to dial the international prefix which differs from country to country and also serves to identify the number following as the international telephone number. 7.2 Use of parentheses The symbol ( ) (parentheses) should be used to indicate that
44、the digits within the ( ) are not always dialled. The ( ) should enclose: the trunk prefix and trunk code in a national number3; the trunk code when the trunk prefix is not in universal use within a country. This is done to remind the user not to dial the enclosed digits for calls within the same nu
45、mbering area. The ( ) should not be used in an international number. 7.3 Multiple numbers reached through automatic search For a subscriber with multiple numbers reached through automatic search from the main number, only the main number should be printed, without any symbol to denote the existence
46、of the multiple numbers. This avoids encouraging subscribers to dial other numbers in a group immediately after finding the main number busy, a problem that is particularly important when only calls to the main number are capable of triggering automatic search. _ 2Specific recommendations on the sym
47、bol for buttons 11 to 16 of a telephone keyset are contained in clause 3/E.161. 3It should be noted that certain Administrations, for national purposes, use a hyphen between the trunk code and subscriber number as a substitute for the symbol ( ) parentheses in national numbers. 4 ITU-T E.123 (02/200
48、1) 7.4 Multiple numbers without automatic search For a subscriber with multiple numbers who does not have automatic search, the symbol / (oblique stroke, solidus, or slant) may be used to separate the alternative numbers. Example A: (0607) 123 4567 / 123 7272 / 627 1876 (0607) 123 4567 / 393 9844 /
49、564 1692 + 22 607 123 4567 / 393 9844 To avoid dialling confusion in Example A, it is especially important that there be a space on either side of the symbol /. When it is desired to abbreviate the alternative numbers and they are consecutive, only the last digit should be shown for the alternative numbers. Example B: (0607) 123 4567 / 8 / 9 To avoid dialling confusion in Example B, it is especially important that there be
