November 27, 2005
Phreaking on VoIP
Experts feel that hackers or phreakers may succeed in making free calls by manipulating the data that is switched through hybrid TDM-VoIP networks. The hacking can be carried out by tricking the system into believing that the call is no longer connected whereas the call is still continuing in reality. The billing software logs the call as disconnected and does not charge the call. The incidents of VoIP hacking are on the rise due to increased usage and people getting familiar with the technology.
The term phreaking evolved with the advent of hackers who concentrated on telecom systems to make free calls and gather information on the telecom infrastructure in order to manipulate it. The Asterisk SIP server, which is downloaded close to 1,000 times every day, is not vulnerable to phreaking attacks when the default is implemented.
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