No. Its not a typo. Vishing is a new twist on phishing scams using voice, typically VoIP. There have been two prevalent vishing scams recently: one selling extended automobile warranties and one offering to reduce your interest rate on your credit cards. You may have received such calls on your home or mobile phone. Don’t bother trying to use the number on your caller ID to contact them or file a complaint though- its spoofed. The FCC has filed lawsuits against the telemarketing firms behind these scams. For more about these scams and the details on vishing in general read Protecting Yourself From Vishing Attacks.