TeleSign

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TeleSign is a global Internet security company providing phone-based authentication and verification services to help web-based organizations identify and substantially reduce online fraud and spam.

TeleSign serves organizations of all sizes including some of the world's largest and most prominent web businesses and has transacted more than a billion authentication and verification transactions to over 200 countries in over 50 languages. TeleSign guarantees enterprise-level uptime and provides industry-leading global deliverability rates.

http://www.telesign.com/