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A Universal International Freephone Number (UIFN) is a worldwide toll-free "800 number" issued by the International Telecommunication Union. Like the 800 area code issued for the North American Numbering Plan in the United States and Canada and 0800 numbers in many other countries, the call is free for the caller while the receiver pays the ...
DSL, ISDN, Wireless, and VoIP products for communications devices BigAir: Sydney: Australia: DSL services and Australia's National Broadband Network CallFire: Santa Monica: United States: Web-based VoIP Comwave: Toronto: Canada: Web and Mobile applications, VoIP telephone service, broadband internet providers, and commercial telecommunication ...
The VoIP E911 emergency-calling system associates a physical address with the calling party's telephone number. All VoIP providers that provide access to the public switched telephone network are required to implement E911, a service for which the subscriber may be charged. "VoIP providers may not allow customers to opt-out of 911 service."
Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing code in the group NXX for various other purposes.
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Automatic number identification (ANI) [1][2] is a feature of a telecommunications network for automatically determining the origination telephone number on toll calls for billing purposes. Automatic number identification was originally created by the American Telephone and Telegraph Company (AT&T) for long distance service in the Bell System ...
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