The Telecommunications Act 2001 and the Telecommunications Amendment Act 2004 provide the legislative framework for the Telecommunications Authority of Trinidad and Tobago to develop a plan for the numbering of telecommunications services. The Authority is also responsible for the administration and management of such numbers.

National Numbering Plan: Central Office (CO) Codes and Home Network Identifier (HNI)
Proposed Central Office Codes Exhaust Analysis Methodology
CO Codes assigned to Service Providers
Application Procedures for Central Office (CO) Codes
Application Procedures for Home Network Identity (HNI)
Determination 2016/01 – Implementation of Number Portability in Trinidad and Tobago
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