Pentesting Telephone-Systems

[sebastian.michel () ctl-loeper de]

Hi,

I spended much time to get technical informations about pentesting telephone systems, but with no success. 

Where are security-flaws, what methods are know to work, which tools are already available and so on.
Did someone have informations about this or can tell me something?

I heard that manufacturer are obligated to build in a backdoor for secret services in their products. Is this right?


thanks,


S.Michel

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