1、 ATIS-0300067 INTERIM NORTH AMERICAN NUMBERING PLAN (NANP) EXPANSION REPORT December 10, 1999 Copyright 1999 by the Alliance for Telecommunications Industry Solutions, Inc. All rights reserved. The INC Interim North American Numbering Plan (NANP) Expansion Report dated December 10, 1999 (former docu
2、ment number INC 99-1210-025) is copyrighted, published and distributed by ATIS on behalf of the Industry Numbering Committee (INC). Except as expressly permitted, no part of this publication may be reproduced or distributed in any form, including electronic media or otherwise, without the prior expr
3、ess written permission of ATIS. Participants in the INC and other parties are hereby authorized to reproduce this document and distribute it within their own business organizations for business purposes, provided that this notice continues to appear in the reproduced documentation. Resale is prohibi
4、ted. For ordering information, please contact: ATIS 1200 G Street N.W., Suite 500 Washington, DC 20005 (202) 628-6380 incatis.org A complete listing of INC Documents is available on the ATIS Web Site at: http:/www.atis.org/inc/docs/.asp ATIS is the leading technical planning and standards developmen
5、t organization committed to the rapid development of global, market-driven standards for the information, entertainment and communications industry. More than 250 companies actively formulate standards in ATIS 18 Committees, covering issues including: IPTV, Service Oriented Networks, Energy Efficien
6、cy, IP-Based and Wireless Technologies, Quality of Service, and Billing and Operational Support. In addition, numerous Incubators, Focus and Exploratory Groups address emerging industry priorities including “Green”, IP Downloadable Security, Next Generation Carrier Interconnect, IPv6 and Convergence
7、. ATIS is the North American Organizational Partner for the 3rd Generation Partnership Project (3GPP), a member and major U.S. contributor to the International Telecommunication Union (ITU) Radio and Telecommunications Sectors, and a member of the Inter-American Telecommunication Commission (CITEL).
8、 For more information please visit . - The Industry Numbering Committee (INC) provides an open forum to address and resolve industry-wide issues associated with planning, administration, allocation, assignment and use of North American Numbering Plan (NANP) numbering resources within the NANP area.
9、This document is maintained under the direction of ATIS and the INC. Suggestions for improvement of this document are welcome. They should be sent to the Alliance for Telecommunications Industry Solutions, INC Staff, 1200 G Street NW, Suite 500, Washington, DC 20005. All changes to this document sha
10、ll be made through the INC issue resolution process and adopted by the INC as set forth in the ATIS Operating Procedures. - Notice of Disclaimer basic human factors; consistency with international standards, etc. When a given option failed to meet this evaluation, the rationale for elimination was d
11、ocumented. This rationale is contained in either Annex C or D of the NANP Expansion Report. Subsequently, a similar process was conducted on a qualitative basis where advantages and disadvantages of the remaining options were identified. This process resulted in the selection of the five options doc
12、umented in this report. INC Interim NANP Expansion Report ATIS-0300067 December 10, 1999 43.0 ASSUMPTIONS AND CONSTRAINTS The following lists the assumptions and constraints that the INC is using to evaluate NANP expansion options. All of these assumptions and constraints have been agreed to by indu
13、stry consensus and all viable options must meet all assumptions and constraints. a. The digits of the NANP will be of the decimal system (i.e., 0-9). b. The control characters, star (*) and number sign (#), will continue to be used only as control characters to indicate a special dialing/addressing
14、function. c. The dial/keyboard/keypad on basic terminals will remain functionally unchanged. d. The basic function of manual “dialing” must be maintained (i.e., automatic input will not become universal). e. The expanded NANP will be consistent with ITU Recommendation E.164 (Public Telecommunication
15、s Numbering Plan). The structure of the ITU Recommendation E.164 number is made up of the following fields: 1 to 3 Digits Max (15 - n) Digits National (Significant) Number Max 15 Digits International Public Telecommunication Number for Geographic Areas Where: CC = Country Code NDC = National Destina
16、tion Code SN = Subscriber Number n = the number of digits in the Country Code f. The length of the National (Significant) Number in the expanded NANP will be limited to twelve digits. This is to ensure compliance with ITU Recommendation E.164 which allows for a maximum length of three digits for the
17、 country code within the maximum length of fifteen digits for the international number. g. The expanded NANP resources will continue to be assigned to and used exclusively by service providers and users who reside in the countries that form the NANP community. CC NDC SN INC Interim NANP Expansion Re
18、port ATIS-0300067 December 10, 1999 5h. The expanded NANP must provide for adequate numbering resources for a competitive environment within any of the countries served by the NANP. i. The expanded NANP must increase the quantity of NPAs in order to ensure the availability of additional NPAs when th
19、e current supply is exhausted j. The expanded NANP must mitigate the need for future NPA relief. k. The expanded NANP shall support the Public Switched Telephone Network. Private numbering plans are not accommodated by these NANP resources. Existing and future services interfaces and network capabil
20、ities should be supported by the expanded numbering resource. l. The expanded NANP should be implementable with sufficient time to permit both an orderly transition to the expanded format and provide sufficient numbering resources to meet industry requirements. m. The expanded NANP must meet applica
21、ble national regulatory or governmental requirements (e.g., number portability) in effect at the time the expanded NANP is implemented. n. The NANP expansion plan must apply throughout the NANP serving area subject to the appropriate regulatory or governmental procedures and constraints. In order to
22、 remain part of the NANP each country must implement the accepted NANP expansion plan. o. The expanded NANP should not be constrained by the current practice of assigning line numbers in blocks of ten thousand to switching entities or points of interconnection (POI). p. The expanded NANP must suppor
23、t service provider number portability in both geographic and non-geographic applications. The following assumptions apply to the portability of geographic numbers: i) NPAs will retain geographic significance (i.e., defined geographic coverage areas); ii) portability with pooling will at a minimum co
24、ver the top one hundred MSAs in the U.S.; iii) portability and pooling in general will not be permitted across numbering plan area boundaries (Note: Where local calling areas cross state boundaries and/or include multiple NPAs, portability may be supported.); iv) portability will apply to all geogra
25、phic numbers used in a wireline/wireless environment; v) location portability will be supported throughout any given portability pooling area and will not be restricted to rate centers; and vi) While service provider portability refers to the ability of end users to retain the same telephone number
26、as they change from one service provider to another, INC Interim NANP Expansion Report ATIS-0300067 December 10, 1999 6service portability refers to the ability of users of telecommunications services to retain existing telecommunications numbers without impairment of quality, reliability or conveni
27、ence when switching from one telecommunications service to another service (i.e. POTS to ISDN) provided by the same telecommunications carrier. q. The expansion plan will consist of two functional components. One to expand NPA capacity and one to mitigate NPA exhaust. r. Both expansion plan componen
28、ts, as described above, will be implemented simultaneously (i.e., no two-phased expansion approach). s. The N restriction (i.e., 2 through 9) will be removed from the C.O. code field (i.e., D digit) coincident with the implementation of the NANP expansion plan. t. The conditions defined in the INC U
29、niform Dialing Plan will be implemented before the NANP expansion plan is implemented. Specifically, the use of the prefix 1 will be eliminated, and all intra-NANP calls will be dialed on a ten-digit only basis. INC Interim NANP Expansion Report ATIS-0300067 December 10, 1999 74.0 OPTION 1-A 4 DIGIT
30、 NPA WITH NEW D DIGIT 4.1 Description of Option This Option adds a fourth digit to the end of the area code field. Option 1-A also releases the first digit of the Central Office Code in the current NANP structure to allow the use of the digits 0 or 1 in addition to the currently available digits 2 t
31、hrough 9. An eleven-digit number is created with this option. The number format for this option is as follows: NXX(X) + XXX + XXXX where N represents digits 2 through 9, X represents digits 0 through 9, and: NXX(X) a four-digit NPA with (X) the additional digit XXX a three-digit Central Office Code
32、with a released D digit XXXX a four-digit line number The existing NANP format (NXX + NXX + XXXX) mathematically provides 6.4 billion numbers (800 x 800 x 10,000). Option 1-A increases the number of available area codes from 800 to 8000 and the number of available Central Office Codes from 800 to 10
33、00. The mathematical quantity of numbers available with this option is therefore: NXX(X) + XXX + XXXX= (8000 x 1000 x 10000) = 80 billion Option 1-A therefore provides approximately a twelve-fold increase in capacity relative to the existing NANP structure. Importantly, within each NPA the quantity
34、of numbers is increased by two million. Option 1-A could potentially be implemented with the new fourth digit of the NPA being either 0 or 1 allocated for Canadas exclusive and permanent use. During a transition period to be defined only the digits 0 and 1 can be used throughout the NANP. All non-ge
35、ographic NPAs will be assigned a new fourth digit, either 0 or 1, across the entire NANP area. The allocation of the specific digits is unresolved. After transition, the values 2-9 will be assigned for growth. Examples of expanded NANP numbers below show the digit 0 being assigned to Canada and the
36、digit 1 assigned to the remainder of the NANP during transition for geographic numbers. For example: 972 NXX XXXX becomes 9721 XXX XXXX 202 NXX XXXX becomes 2021 XXX XXXX 613 NXX XXXX becomes 6130 XXX XXXX 514 NXX XXXX becomes 5140 XXX XXXX INC Interim NANP Expansion Report ATIS-0300067 December 10,
37、 1999 8Non-Geographic NPAs would be changed as follows: 800 XXX XXXX becomes 8000 XXX XXXX 900 XXX XXXX becomes 9000 XXX XXXX Special Use Codes would be dialed as follows: N11 codes would stay N11 950 XXXX would stay 950 XXXX 202 555 1212 would change to 2021 555 1212 555 XXXX would stay 555 XXXX 4.
38、2 Transition Plan Adding the specific new digits (i.e., 0 or 1) in the fourth position of the NPA code creates a means to transition to the expanded format. Since the fourth digit in the existing ten- digit NANP can never have a 0 or 1 in that position, introducing these values in the D digit positi
39、on will provide the necessary indication for all switching equipment and operational systems to ensure identification of an expanded NANP number. Thus, transitioning will be accomplished through this unique assignment of 1 or 0 in the D digit location. Because of this unique assignment, it will be p
40、ossible to allow for a permissive dialing period during which the network will be able to determine whether the caller was dialing a ten-digit or an eleven-digit number by checking the value of the D digit. It is recommended that a six-month permissive dialing period be allowed to effect a smooth tr
41、ansition to the new four digit area codes. During the transition period only four-digit NPAs with 0 or 1 in the D digit position would be introduced. At the end of the transition period, four-digit NPA codes that do not have a 1 or 0 in the fourth digit can then be assigned. 4.3 Significant Advantag
42、es and Disadvantages 4.3.1 Advantages Easy to understand, as it adds a digit at the end of the NPA with a single, uniform rule. Requires no prefix to accomplish the transition because a 0 or a 1 in the new D digit of the four-digit NPA is used as a transition indicator. INC Interim NANP Expansion Re
43、port ATIS-0300067 December 10, 1999 9Retains the existing NPA code as the first three digits of the expanded area code, which maintains “an ERC-like”3format for various services (e.g., 800 becomes 8000, 888 becomes 8880, etc.). Does not require implementation of the INC Uniform Dialing Plan prior to
44、 implementation because there is no need for a prefix to implement this option. Enables all calls to be consistently dialed with eleven digits. Releases the 80 N9X formatted NPAs for immediate assignment, as they are not required for this or future expansion. Enables switches to determine within the
45、 first four digits dialed whether the caller is dialing a ten- or eleven-digit number during transition period. 4.3.2 Disadvantages Prohibits the opening of the D digit to either 0 or 1 prior to the implementation of this option and during the transition period. Does not guarantee the Canadian indus
46、try and regulatory authorities increased flexibility and autonomy in the use of NANP numbering resources. 4.4 Dependencies this is referred to as releasing the D digit. Releasing the D digit will require clearing all uses of the 0 and 1 in the D digit position (e.g., to support internal routing, ide
47、ntification and billing functions, etc.). The network must be able to deal with numbers dialed in expanded NANP format (e.g., NPA XXX INC Interim NANP Expansion Report ATIS-0300067 December 10, 1999 24XXXX) accurately and ubiquitously before any of these numbers are assigned to subscribers. It is re
48、cognized that the current use is extensive and therefore steps must be taken to eliminate it prior to the rollout of NANP expansion to ensure successful and on-time implementation of NANP expansion. An evolution scenario is depicted below. The Years X and Y are independent of each other and are not
49、necessarily intended to take place sequentially and may or may not take place in parallel. PHASE ACTIVITY/MILESTONE DATE/TIMING 1 Commence Implementation of INC Uniform Dialing Plan Year X (TBD) 2 INC Uniform Dialing Plan in place Year X + 5 3 Prefix 1 “cooling-off“ period Year X + 10 4 NANP expansion trigger* Year Y (TBD) 5 Commenc
