telecommunication security?

i want to learn the security issues related to PBX,telephone Exchange and telecomminications, scratch cards ,prepaid cards, satellite security from beginning to advance level probably from a hackers perspective. Is there any comprehensive material and sites avaible on internet, or any ebook avaible for download? i cant find any , there is just introduction , is there any thesis releted to it , please tell me urgent as i want to submit my reports in a week.
i have searched the sites like

but there are papers mostly related to a particular company scenario or they just mentioned the security problem in a field , no types of attacks and how to avoid them nothing is there.

i will be thankful to you people if you help me in this regard immediately.
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baburkhanAuthor Commented:
i have alreasy seen and started , i know about that but cant find any detailed paper or ebook on it.
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