VOIP. (2011, May 1). Retrieved March 28, 2025, from http://www.essayworld.com/essays/VOIP/98665
"VOIP." Essayworld.com. Essayworld.com, 1 May. 2011. Web. 28 Mar. 2025. <http://www.essayworld.com/essays/VOIP/98665>
"VOIP." Essayworld.com. May 1, 2011. Accessed March 28, 2025. http://www.essayworld.com/essays/VOIP/98665.
"VOIP." Essayworld.com. May 1, 2011. Accessed March 28, 2025. http://www.essayworld.com/essays/VOIP/98665.