National Numbering Plan: Central Office (CO) Codes and Home Network Identifier (HNI)
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Telecommunications Authority of Trinidad and Tobago NNaattiioonnaall NNuummbbeerriinngg PPllaann:: CCeennttrraall OOffffiiccee ((CCOO)) CCooddeess aanndd HHoommee NNeettwwoorrkk IIddeennttiiffiieerr ((HHNNII)) September 9, 2011 TATT 2/3/7 National Numbering Plan: Central Office (CO) Codes and Home Network Identifier (HNI) Maintenance History Date Change Details Version May 6 2005 First Consultative Draft 0.1 July 10 2009 Second Consultative Draft based on comments 0.2 received in the 1st round of consultation September 7 Final Draft 0.3 2009 Modifications made based on the 2nd round of consultation 9th September Approved Version 1.0 2011 September 9, 2011 2 TATT 2/3/7 National Numbering Plan: Central Office (CO) Codes and Home Network Identifier (HNI) Table of Contents MAINTENANCE HISTORY ......................................................................................................... 2 TABLE OF CONTENTS ................................................................................................................ 3 LIST OF TABLES ........................................................................................................................... 5 EXECUTIVE SUMMARY .............................................................................................................. 1 1 OBJECTIVES ........................................................................................................................... 3 2 RELEVANT LEGISLATIVE FRAMEWORK...................................................................... 3 3 BACKGROUND ...................................................................................................................... 4 3.1 BASIC MODEL – NORTH AMERICAN NUMBERING PLAN ..................................................... 4 3.2 IMPORTANCE OF NUMBERING ............................................................................................. 6 3.3 AVAILABILITY OF NUMBERS ............................................................................................... 6 3.4 NANPA RESOURCES .......................................................................................................... 7 3.5 NON-NANPA RESOURCES ................................................................................................. 7 4 MODIFICATION OF DOCUMENT ................................................................................... 8 5 THE CONSULTATION PROCESS ..................................................................................... 8 6 CURRENT CO CODE ASSIGNMENTS ........................................................................... 10 7 CONSIDERATIONS: CO CODE ALLOCATION AND ASSIGNMENT ..................... 13 7.1 CENTRAL OFFICE (CO) CODES – MIGRATION OF NUMBERS ............................................. 13 7.2 NORTH AMERICAN NUMBERING PLAN (NANP) EXPANSION ............................................ 16 7.3 FUTURE SERVICES............................................................................................................. 18 7.4 VERTICAL SERVICE CODES ............................................................................................... 19 7.5 FURTHER CONSIDERATIONS .............................................................................................. 24 8 CONSIDERATIONS: HNI ASSIGNMENTS .................................................................... 26 8.1 INTERNATIONAL MOBILE SUBSCRIBER IDENTIFIER (IMSI) ............................................... 26 9 PROPOSED NUMBERING SCHEME FOR CO CODE ALLOCATION .................... 29 9.1 GUIDING PRINCIPLES FOR NUMBERING SCHEME ............................................................... 29 9.2 PROPOSED NUMBERING SCHEME FOR CO CODE ALLOCATION ......................................... 30 9.2.1 Reserved Central Office Codes ............................................................................... 32 9.2.2 Abbreviated Dialing Services .................................................................................. 33 9.2.3 Reservation for Government Use ........................................................................... 34 9.3 CAPACITY ANALYSIS ........................................................................................................ 34 10 NUMBER CONSERVATION METHODS FOR CO CODE NUMBERING RESOURCES ................................................................................................................................. 36 10.1 NUMBERING FEES ............................................................................................................. 36 10.2 TELEPHONE NUMBER RECYCLE POLICY ........................................................................... 37 10.3 NUMBER UTILISATION THRESHOLD .................................................................................. 38 September 9, 2011 3 TATT 2/3/7 National Numbering Plan: Central Office (CO) Codes and Home Network Identifier (HNI) 11 GUIDELINES FOR THE ADMINISTRATION OF THE NATIONAL NUMBERING PLAN: CO CODES AND HNI .................................................................................................... 39 11.1 COMPANY CODE (OCN) ASSIGNMENT PROCEDURES ........................................................ 40 11.2 CENTRAL OFFICE CODE ASSIGNMENT GUIDELINES .......................................................... 41 11.2.1 INC Website Identification ..................................................................................... 41 11.2.2 Constraints and Assumptions ................................................................................. 41 11.2.3 Assignment Principles............................................................................................. 42 11.2.4 Criteria for the Assignment and Reservation of Central Office Codes................. 42 11.2.5 CO Code (NXX) Assignment Functions ................................................................ 43 11.2.6 Responsibilities of Code Applicants and Code Holders ......................................... 44 11.2.7 Criteria for the Transfer of Central Office Codes ................................................. 45 11.2.8 Reclamation ............................................................................................................. 45 11.2.9 CO Code Conservation Methods ............................................................................ 47 11.3 HOME NETWORK IDENTITY (HNI) ASSIGNMENT GUIDELINES .......................................... 48 11.3.1 Assumptions and Constraints ................................................................................. 49 11.3.2 Assignment Principles............................................................................................. 49 11.3.3 Criteria for HNI Assignment .................................................................................. 52 11.3.4 Responsibilities of HNI Applicants and Assignees ................................................ 52 11.3.5 Responsibilities of the Authority............................................................................. 53 11.3.6 HNI Return and Reclamation Procedures ............................................................. 56 11.3.7 IMSI Resource Conservation and Assignment Audits .......................................... 56 11.4 ASSIGNMENT GUIDELINES FOR OTHER NUMBERS USED FOR NETWORK IDENTIFICATION AND SIGNALLING .......................................................................................................................... 59 ANNEX I – DECISION ON RECOMMENDATIONS MATRIX (1ST CONSULTATIVE ROUND).......................................................................................................................................... 61 ANNEX II – DECISION ON RECOMMENDATIONS MATRIX (2ND CONSULTATIVE ROUND).......................................................................................................................................... 66 September 9, 2011 4 TATT 2/3/7 National Numbering Plan: Central Office (CO) Codes and Home Network Identifier (HNI) List of Tables Table 1: CO Code Number Assignments to Concessionaires of Public Telecommunications Services ............................................................................................................................................ 10 Table 2: Dialling Scheme for the Republic of Trinidad and Tobago .............................................. 11 Table 3: Vertical Service Code List for Public Fixed Telecommunications Services ..................... 20 Table 4: Vertical Service Code List for Public Mobile Telecommunications Services .................. 24 Table 5: Proposed Numbering Scheme for CO Code Allocation .................................................... 30 Table 6: List of Reserved Central Office Codes .............................................................................. 32 Table 7: Capacity Analysis based on CO Code Allocation ............................................................. 35 September 9, 2011 5 TATT 2/3/7 National Numbering Plan: Central Office (CO) Codes and Home Network Identifier (HNI) Executive Summary This National Numbering Plan is one in a series of National Numbering Plans that will govern the administration of national numbering resources in the Republic of Trinidad and Tobago, in accordance with the Telecommunications (Numbering) Regulations. The number resources addressed in this Plan are Central Office (CO) codes and Home Network Identity (HNI) assignments. This document examines the current allocation of numbers for public fixed (wired/wireless) and