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- $94.25Polycom 2200-46161-001 220046161001 VVX 310 Business Media Voice Over IP Phone 6 Line w ACNewegg
- $7.49Voice over IP by Uyless BlackBetter World Books
- $3.98Voice Over IP Networks by Marcus GoncalvesBetter World Books
- $3.98Voice over IP Networks by Ulysses D. BlackBetter World Books
- $387.84Polycom VVX 150 SIP Voice Over IP Phone with Savi W8220 Wireless HeadsetNewegg
- $134.90Polycom VVX 411 Corded Voice Over IP Phone w/ 12-line Operation (2200-48450-025)Newegg
- $33.00Unlocked VoIP Gateway, Internet Phone Adapter PAP2T with 2 Ports for Voice-Over-IP Support fax and Multi-Voice(U.S. regulations)Amazon
- $5.39Delivering Voice over IP Networks by Daniel, Minoli, Emma MinoliBetter World Books
- $9.99Delivering Voice over Ip NetworksAmazon
- $53.96Carrier Grade Voice Over IP (Professional Telecommunications)Amazon
- $69.46Carrier Grade Voice Over IP, Third EditionAmazon
- $7.11Carrier Class Voice-Over IP by Daniel CollinsBetter World Books
- $7.66Deploying Cisco Voice over IP Solutions by Jonathan DavidsonBetter World Books
- $10.53VoIP : Wireless, P2P and New Enterprise Voice over IP by Sudeept, Ganguly, Samrat BhatnagarBetter World Books
- $6.87Converged Network Architectures : Delivering Voice over IP, ATM, and Frame Relay by Oliver C. IbeBetter World Books
- $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