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E.164 is an international standard (ITU-T Recommendation), titled The international public telecommunication numbering plan, that defines a numbering plan for the worldwide public switched telephone network (PSTN) and some other data networks. E.164 defines a general format for international telephone numbers.
In order to use an inmate telephone service, inmates must register and provide a list of names and numbers for the people they intend to communicate with. [5] Call limitations vary depending on the prison's house rule, but calls are typically limited to 15 minutes each, and inmates must wait thirty minutes before being allowed to make another call. [6]
Country codes are prefixes to national telephone numbers that denote call routing to the network of a subordinate number plan administration, typically a country, or group of countries with a uniform numbering plan, such as the NANP. E.164 permits a maximum length of 15 digits for the complete international phone number consisting of the ...
Telephone number mapping is a system of unifying the international telephone number system of the public switched telephone network with the Internet addressing and identification name spaces. Internationally, telephone numbers are systematically organized by the E.164 standard, while the Internet uses the Domain Name System (DNS) for linking ...
Securus Technologies is a technology communications firm serving department of corrections facilities and incarcerated individuals across the country. [1][2] The company is a subsidiary of Aventiv Technologies. In the past, the company has faced criticism over phone call pricing, data security, monopoly [3] and product innovation.
NSN (National (Significant) Number) Usage of E.164 number Old number New number – 20XX XXXX: Future use – 21XX XXXX: Fixed telephony geographic number – metropolitan area 2XX XXXX: 22XX XXXX: Fixed telephony geographic number – metropolitan area 3XX XXXX: 23XX XXXX: Fixed telephony geographic number – central area 4XX XXXX: 24XX XXXX
Instead of E.164/2002, another more ambitious numbering plan was proposed. In this plan the prefix 0 was discarded, and the area codes were defined differently, with 20 to 49 for geographic areas, 50 to 59 reserved, 60-69 for nationwide numbering, 70-79 for mobile services, 80-89 for shared-cost and toll-free numbers, and 90 for premium-rate ...
Country codes are defined by the International Telecommunication Union (ITU) in ITU-T standards E.123 and E.164. The prefixes enable international direct dialing (IDD). Country codes constitute the international telephone numbering plan. They are used only when dialing a telephone number in a country or world region other than the caller's.
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