For those who don't know much about CALEA here is a short article from an industry rag[0] and a more technical document on a specific solution by Cisco[1] [0]

For those who don't know much about CALEA here is a short article from an industry rag[0] and a more technical document on a specific solution by Cisco[1] [0] https://insidersurveillance.com/calea-solutions-should-you-buy-active-or-passive/ https://insidersurveillance.com/calea-solutions-should-you-b... [1] http://www.cisco.com/web/about/security/intelligence/LI-3GPP.html http://www.cisco.com/web/about/security/intelligence/LI-3GPP...