$7.49
Voice over IP by Uyless BlackBetter World Books$3.98
Voice Over IP Networks by Marcus GoncalvesBetter World Books$3.98
Voice over IP Networks by Ulysses D. BlackBetter World Books$387.84
Polycom VVX 150 SIP Voice Over IP Phone with Savi W8220 Wireless HeadsetNewegg$134.90
Polycom VVX 411 Corded Voice Over IP Phone w/ 12-line Operation (2200-48450-025)Newegg$94.25
Polycom 2200-46161-001 220046161001 VVX 310 Business Media Voice Over IP Phone 6 Line w ACNewegg$33.00
Unlocked VoIP Gateway, Internet Phone Adapter PAP2T with 2 Ports for Voice-Over-IP Support fax and Multi-Voice(U.S. regulations)Amazon$6.01
Delivering Voice over IP Networks by Daniel, Minoli, Emma MinoliBetter World Books$9.99
Delivering Voice over Ip NetworksAmazon$53.96
Carrier Grade Voice Over IP (Professional Telecommunications)Amazon$69.46
Carrier Grade Voice Over IP, Third EditionAmazon$7.11
Carrier Class Voice-Over IP by Daniel CollinsBetter World Books$7.68
Deploying Cisco Voice over IP Solutions by Jonathan DavidsonBetter World Books$10.53
VoIP : Wireless, P2P and New Enterprise Voice over IP by Sudeept, Ganguly, Samrat BhatnagarBetter World Books$6.69
Converged Network Architectures : Delivering Voice over IP, ATM, and Frame Relay by Oliver C. IbeBetter World Books$4,591.49
Cisco VG310 - Modular 24 FXS Port Voice over IP Gateway - 2 x RJ-45 - USB - Management Port - Gigabit Ethernet - 1 x Expansion SlotsOffice Depot$11.00
IT 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