What does IFB stand for?

MLA style: "IFB." Acronym Finder . 2013. AcronymFinder.com 22 May. 2013 http://www.acronymfinder.com/Interruptible-Fold_Back-(IFB).html
Chicago style: Acronym Finder . S.v. "IFB." Retrieved May 22 2013 from http://www.acronymfinder.com/Interruptible-Fold_Back-(IFB).html
APA style: IFB. (n.d.) Acronym Finder. (2013). Retrieved May 22 2013 from http://www.acronymfinder.com/Interruptible-Fold_Back-(IFB).html

Interruptible Fold-Back

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Inter Ferry Boat Intercom Fold Back (earpiece) Intermediate Functional Block (Linux operating system) Internal Fold-Back International Finance and Business International Finance Bank (Florida) Internationalen Filmfestspiele Berlin (German: International Film Festival of Berlin) Internet for Business (UK) Internet Free/Busy Interruptible Feedback		Invitation For Bid(s) Invitation for Bidders Irish Film Board (Ireland) Is Finished By (time or date) Issue for Bid (construction) Independent Food Brokers of America Integral Fuel Burnable Absorber International Federation of Broomball Associations International Female Boxers Association International Fire Buff Associates