What does 2VF stand for?

MLA style: "2VF." Acronym Finder . 2013. AcronymFinder.com 20 May. 2013 http://www.acronymfinder.com/2-Voice-Frequency-(telephony)-(2VF).html
Chicago style: Acronym Finder . S.v. "2VF." Retrieved May 20 2013 from http://www.acronymfinder.com/2-Voice-Frequency-(telephony)-(2VF).html
APA style: 2VF. (n.d.) Acronym Finder. (2013). Retrieved May 20 2013 from http://www.acronymfinder.com/2-Voice-Frequency-(telephony)-(2VF).html

2 Voice Frequency (telephony)

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