(Internet Telephony Service Provider) An ISP or telephone company that provides voice over IP (VoIP) phone calls. See VoIP, IP gateway and ITXC.
"ITSP." YourDictionary, n.d. Web. 17 October 2018. <http://www.yourdictionary.com/itsp>.
ITSP. (n.d.). Retrieved October 17th, 2018, from http://www.yourdictionary.com/itsp
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