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Telecom Routing Administration

The industry recognized source for routing and rating data

Related Web Sites

The following sites are highly correlated with the aspects of telephony that are supported by Telecom Routing Administration (TRA).  These sites provide additional documentation and support the processes that are in effect, or are being developed, to address the intricacies of working within today's telephony environment, and in planning for tomorrow.  In addition to the listed sites, those maintained by telephone companies, equipment manufacturers, hardware/software vendors, regulatory bodies and associations not listed below, are also valuable sources of information. The links provided below are generally to a home page to avoid needing to maintain site changes that might occur at a specific sub-page. Also, several of these sites have themselves, links to other pertinent sites.

Site URL Description The North American Numbering Plan Administration (NANPA) assigns and provides listings for Carrier Identification Codes (CICs), 456/900 NXXs, 5XX-NXXs, 555 line numbers, 800-855 line numbers, ANI Information Identifier (II) digits, Vertical Service codes, and other related numbering data.

For CO Code Administration (assignment of NXXs within an NPA):
  • US and US Territories: Managed by a group at
  • Canada: Managed by Canadian Numbering Administration (CNA) at CNA also processes applications for NANP resources needed in Canada and acts as the interface between Canadian companies and NANPA in all other NANPA functions (e.g. CIC Code, 500, 900 assignments).
  • Atlantic/Caribbean: 17 countries participate in the NANP. Management of CO Code Administration varies by country. Pool Administration (assignment of blocks within an NXX):

Information, supporting documentation, forms, procedures, etc. as pertain to the "pooling" of NXXs within the United States is provided at this site that is maintained by the National (U.S.) Number Pool Administrator. iconectiv is the company in which the Telecom Routing Administration (TRA) resides and from which TRA products  described throughout this web site, such as the LERG, are provided.  Beyond TRA and TRA products, iconectiv supports other aspects of numbering, routing, and interconnection on a national and international basis.  iconectiv's powerful, trusted, neutral solutions for the telecommunications industry includes number portability clearinghouses, mobile messaging services, anti-theft mobile device registries, spectrum management databases and other interconnection information services. iconectiv's solutions are used by more than 1,000 operators, regulators and content providers and are currently used to provide services to over 1 billion end users.
COMMON LANGUAGE COMMON LANGUAGE is organization within iconectiv that maintains various "code sets" that play an important part in network management. These include CLLI™ (unique to equipment (e.g. switch) location and function), CLCI™-MSG (trunk circuit), CLCI-S/S (special services circuit), CLEI™ (equipment), CLFI™ (facility), and NC/NCI (network channel and interface). Also maintained are General codes (e.g. IACs used to populate fields such as ACNA (Access Customer Name Abbreviation) used in forms/processes such as ASRs (Access Service Requests) and LSRs (Local Service Requests). The COMMON LANGUAGE organization is active in North American (e.g. ANSI, T1) and international (e.g. ITU) standards as they relate to these code sets. The Alliance for Telecommunications Industry Solutions (ATIS) is comprised of a broad cross section of telecommunications related companies. Sponsored committees under the ATIS umbrella take a proactive role in developing and maintaining industry standards, guidelines, and the introduction of new technology and processes. The committees most closely involved with TRA processes are the Next Generation Interconnection Interoperability Forum (NGIIF), the Industry Numbering Committee (INC), and the Ordering and Billing Forum (OBF).  Several other ATIS committees also influence the direction and content of TRA products. The National Exchange Carrier Association (NECA) administers a nationwide interstate access charge plan and helps ensure universal telephone service. Additionally, the Association participates in FCC and court proceedings in matters related to the access charge plan adopted in 1983, and trains thousands of industry employees on access charge regulations, rate and tariff matters, and settlements. NECA assigns Company Codes which serve as a basis for most TRA Operating Company Numbers (OCNs). iconectiv is the designated agent for the administration and assignment of SS7 point codes within the United States as well as all other countries within the North American Numbering Plan in accordance with ANSI T1.111.   Point codes are required for all signaling points using the SS7 (Signaling System 7, also known as Common Channel Signaling) network.  Point codes identify network nodes in order that the SS7 network can route calls properly. iconectiv, as IMSI administrator, participates in the management of all segments of the IMSI, but directly administers only the Home Network Identity (HNI) segment. HNIs are assignable to operators of public mobility services with international roaming capabilities. The HNI uniquely identifies the home network of a public mobility service subscriber and contains the Mobile Country Code (MCC) and the Mobile Network Code (MNC). The remaining segment of the IMSI, the Mobile Station Identification Number (MSIN), is directly administered by the network operator to which the HNI is assigned. The North American Numbering Council (NANC) was established by the Federal Communications Commission (FCC) to provide guidance in the administration of the NANP. It also provides advice and recommendations to the FCC and other NANP member governments on numbering issues and is involved with several aspects of Local Number Portability (LNP). The National Association of Regulatory Utility Commissioners (NARUC) is an association with membership from numerous utility commissions. This site contains links to state Public Utility Commission (PUC) sites, and to some Canadian, Mexican, and other International sites. Utility commissions handle various types of "utilities" that usually includes a telecommunications component. PUC sites vary in content but often include information regarding Area Code splits/overlays, tariff information, and orders, bulletins, filings, etc. on various telecommunications matters. The United States Telecom Association (historically known as USTA) is a forum for the small, mid-size and large companies of the local exchange carrier industry to discuss and resolve issues of mutual concern. World of Wireless - sponsored by the Cellular Telecommunications Industry Association (CTIA). The Canadian Radio-television and Telecommunications Commission (CRTC) is an independent federal agency in Canada, analogous to the US Federal Communications Commission (FCC). Comisión Federal de Telecomunicaciones (Cofetel) supports the Mexican telecommunications industry and processes. Included at this site are Mexican Numbering and Signaling plans. Most of the site is in Spanish, although some English documents are available. The International Telecommunications Union (ITU), headquartered in Geneva, Switzerland, is an international organization within which governments and the private sector coordinate global telecom networks and services. A list of assigned country codes may be available at the ITU web site (the site and availability of information changes often). The American National Standards Institute (ANSI) has served in its capacity as administrator and coordinator of the United States private sector voluntary standardization system for 80 years. Various telephony related "standards" documents are available.