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Telephone Verification

With over 100 million transactions processed, TeleSign is the most respected name in the field of telephone verification and protects the websites of the biggest companies on the internet.

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Integration PHP

The archive linked below contains everything you need to get started with implementing TeleSign phone verification in PHP. You will find examples that will instruct you how to use the attached API library.
telesign-api-php.zip (Update: 21.04.2010)