These are important links to know when you’re going to enter the telecom world for security assessment.

Ericsson data

http://en.wikipedia.org/wiki/PLEX_(programming_language)

http://en.wikipedia.org/wiki/AXE_telephone_exchange

Billing

http://en.wikipedia.org/wiki/Billing_Mediation_Platform

http://en.wikipedia.org/wiki/Online_charging_system

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