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As already explained, a spoofing attack is a situation where an attacker masquerades as another by falsifying data and thereby gaining an illegitimate advantage. Modifying the SIP From header, a malicious user is able to trivially forge an arbitrary caller ID. This allows some weak authentication mechanisms (such as the ones frequently used by voicemail services) to be bypassed and may help with social engineering attacks, which can have potentially important consequences for an organization's security.

Beside the obvious caller ID spoofing, a successful attack compromises the integrity requirement of the CIA paradigm and in some cases may also lead to toll fraud.

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