Research and Paper on PBX security, exchange security and telecommunication security?

hi
i want to learn the security issues related to PBX,telephone Exchange and telecomminications from beginning to advance level. is there any comprehensive material and sites avaible on internet. i cant find any , there is just introduction , is there any thesis releted to it , please tell me urgent as i want to explain things related to it to my boss.
thanks in advance
baburkhanAsked:
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fadiramadaCommented:
Hello,

Hope these links help:

http://iroi.seu.edu.cn/books/ee_dic/whatis/pbx.htm

http://www.telecommagazine.com/

This should be more than enough,

Thanks,

Fadi Ramada.
Net+, Security+
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baburkhanAuthor Commented:
no man i searched the above sites but cant find any good and explainatary material on them.there are papers from different companies but relate to their own scenario and services. is there any other site?
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