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IP Communications and Services for NGN
book

IP Communications and Services for NGN

by Johnson I Agbinya
December 2009
Intermediate to advanced content levelIntermediate to advanced
411 pages
12h 24m
English
Auerbach Publications
Content preview from IP Communications and Services for NGN
336 IP Communications and Services for NGN
Testing
Testers found that turning on the router’s QoS feature improved voice quality dra-
matically, even over non-busy networks. However, the NAT (network address trans-
lation) feature that many companies use as a security feature on their routers breaks
VoIP entirely. In a recent article by Tim Green [1], volunteers set up five model
enterprise networks fitted with VoIP equipment, network firewalls, application fire-
walls, Wi-Fi access points, and VPNs; they ran VoIP calls through them, using a
variety of VoIP phones—softphones, hardphones, Wi-Fi handsets, and PDAs. e
tests involved equipment from two dozen vendors. e calls ran over a combination
of the public phone network and the Internet, u
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Publisher Resources

ISBN: 9781420070910