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This Recommendation defines the design, characteristics and application of the Numbering Plan for Public Data Networks, facilitating their operation and interworking worldwide through Data Country
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01
Obtain the ITU-T Recommendation X.121 document.
02
Familiarize yourself with the definitions outlined in the document.
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Who needs itu-t recommendation x121?

01
Telecommunication companies seeking to standardize numbering plans.
02
Regulatory bodies overseeing telecommunications.
03
Service providers implementing ISDN and PSTN services.
04
Organizations participating in international communications.
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ITU-T Recommendation X.121 defines the specification for international numbering plan for public data networks, focusing on the Functional Group Identifier (FGI) associated with data terminal equipment.
Telecommunications operators and service providers that implement data network services and require international numbering for data terminals are primarily required to file ITU-T Recommendation X.121.
To fill out ITU-T Recommendation X.121, users should provide specific details about their networks, including the network identifier, service type, and any relevant data concerning their terminal equipment.
The purpose of ITU-T Recommendation X.121 is to facilitate the international exchange of data communications by providing a standardized numbering plan that ensures interoperability between different data networks.
The information that must be reported on ITU-T Recommendation X.121 includes the identification of the service provider, assigned number ranges, network capabilities, and the type of applications supported by the network.
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