Vishing = 'Voice' + Phishing

Using social engineering and Voice over IP (VoIP)

Vishing exploits the public's trust in landline telephone services

traditionally terminated in physical locations which are known to the telephone company, and associated with a bill-payer

but VoIP allows for caller ID spoofing, inexpensive, complex automated systems and anonymity for the bill-payer

Vishing is very hard for legal authorities to monitor or trace

A good example of a vish: I Work For The Credit Card Company ...

See also the cheque and e-mail forms ones on the same page

Reference: Wikipedia: Vishing