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- $7.49Voice over IP by Uyless BlackBetter World Books
- $36.54Unlocked VoIP Gateway, Internet Phone Adapter PAP2T with 2 Ports for Voice-Over-IP Support fax and Multi-Voice(U.S. regulations)Amazon
- $9.99Delivering Voice over Ip NetworksAmazon
- $34.18Carrier Grade Voice Over IP (Professional Telecommunications)Amazon
- $95.00Carrier Grade Voice Over IP, Third EditionAmazon
- $90.25Carrier Grade Voice Over IP, Third EditionAmazon
- $4,591.49Cisco VG310 - Modular 24 FXS Port Voice over IP Gateway - 2 x RJ-45 - USB - Management Port - Gigabit Ethernet - 1 x Expansion SlotsOffice Depot
- $11.00IT Questions & Answers For IT Job Interviews (General IT Knowledge / Transmission Lines and Cabling / Voice over IP (VoIP) / Video and Telepresence over IP / Wireless (Wi-Fi))Amazon