A form of phishing attack which takes place over VoIP. In this attack, the attacker uses VoIP systems to be able to call any phone number with no toll-charge expense. The attacker often falsifies their caller-ID in order to trick the victim into believing they are receiving a phone call from a legitimate or trustworthy source such as a bank, retail outlet, law enforcement or charity. The victims do not need to be using VoIP themselves in order to be attacked over their phone system by a vishing attack. (See phishing.)