June 2005
Intermediate to advanced
502 pages
21h 48m
English
Content preview from Switching to VoIP
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Voice QoS on Windows
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Residential and Small-Office VoIP Routers
A new breed of residential gateway routers has begun to appear on the scene: rout-
ers with a built-in SIP or SCCP client and one or more analog RJ11 telephone con-
nections. These devices enable routing and firewalling of Internet traffic, as well as
ATA-type functionality so the connect analog phone(s) can make and receive VoIP
calls over the Internet.
Inside the router’s firmware, a SIP proxy and IP precedence measures may even exist,
so groups of IP phones can be used to dial voice calls over the Internet. Some of these
routers even offer to route calls over a local analog PSTN phone line if the Internet
service fails. Check the specs to see what your VoIP router is capable of.
A newer breed of broadband router has gained popularity recently.
The IAD, or integrated access device, is a combination router and data
link interface (i.e., DSL or cable modem).
Most recently, IADs like the Zoom X5 series have begun to add VoIP
capabilities and can even support QoS and analog phones. If you don’t
like clutter, consider using an IAD to connect your residence or small
office. For more information about how these devices improve remote
site survivability, read Chapter 13.
Voice QoS on Windows
Windows XP and 2003 can be used as routers ...
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