June 2005
Intermediate to advanced
502 pages
21h 48m
English
Content preview from Switching to VoIP
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Chapter 13: Network Infrastructure for VoIP
and, if configured for a VoIP network, attempts to register with a VoIP server. It
doesn’t care where the VoIP server is. It could be in the next room over, or it could
be in Manitoba, Canada. Such is the nature of TCP/IP. The point here is that you can
set the behavior of the IP hardphone to be identical no matter from where it con-
nects. In theory, if you provide for a consistent registration path from any spot on the
Internet, the phone will behave consistently regardless of where it’s sitting. (This is
what Vonage and BroadVoice have done.)
Like your corporate web site, which can be viewed by mobile users anywhere in the
world, it’s possible for you to allow your telephony users to access your voice ser-
vices from anywhere in the world.
But there are a few gotchas to this Utopian road warrior’s dream:
• There ought to be firewall(s) between the road warrior and his VoIP network.
Depending on your network’s requirements, you may need to allow TFTP, RTP,
IAX, SIP, H.323, SCCP, and the host of VoIP-related traffic (port numbers and
protocols can be referenced in Chapter 10).
• Don’t bet on hotels and other road warrior hotspots offering inline power. Make
sure the road warrior carries an AC power adapter for his hardphone.
• In order
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.