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Telephone number verification (or validation) services are online services used to establish whether a given telephone number is in service. They may include a form of Turing test to further determine if a human answers or answering equipment such as a modem, fax, voice mMail or answering machine. ==Purpose== Verification services are often used to limit sockpuppetry, underage sign-ups, spamming and illegal activities like harassment, scams and fraud. Operators and their clients include: * Lead generation companies * Social networking sites * Internet forums * dating sites and * wikis Any verification operation which sells sets of contact numbers generated through its marketing operations will gain a premium for an efficient list of “clean” numbers. Call center outbound telephone campaigns save time and resources bypassing undefined or mechanized equipment numbers. Telephone numbers entered into an online sign-up form can be checked in real time, by implementing AJAX (background web page processing) type call to a telephone number verification service while the form is still being filled in. To thwart fraud, it is possible to match an online customer to the telephone number owner, to certify it is in fact the same person who owns it. This service is of increasing value to online store managers, banks and credit card processors, who are faced with increasing quantities of attempts to make fraudulent purchases such as by those using stolen credit card details. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Telephone number verification」の詳細全文を読む スポンサード リンク
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