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http://www.cisco.com/warp/public/cc/p...iosw/ioft/iofwft/prodlit/difse_wp.htm
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http://www.cisco.com/warp/public/707/22.html
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http://www.voip-info.org/wiki/index.php?page=Asterisk+cisco+FXO
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http://www.cisco.com/c/en/us/products...e_paper_c11-713103.html#_Toc331821650
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