June 2005
Intermediate to advanced
502 pages
21h 48m
English
Content preview from Switching to VoIP
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VoIP Service Providers
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TFTP Servers and Tools
TFTP (Trivial File Transfer Protocol) is the means by which IP phones obtain firm-
ware loads and, sometimes, their operating configurations. This basic, insecure file-
transfer system allows you to store a repository of VoIP-related files—like SIP phone
config files, firmware patches, XML user directory files, and ring tones—in a central
place. Your DHCP server can tell IP phones the IP address of the TFTP server so they
can download the files they need.
Linux, FreeBSD, and Mac OS X have the common TFTP server tftpd. A fantastic GUI
add-on for the OS X version of tftpd is TFTPServer, which you can download from
http://www.versiontracker.com/dyn/moreinfo/macosx/18561.
Windows users with Cisco CCO accounts can download a good TFTP server from
http://www.cisco.com/cgi-bin/tablebuild.pl/tftp, while other Windows users can get a
shareware one from http://www.tftp-server.com.
VoIP Service Providers
Service providers sell dial-tone or call-origination applications, bulk voice trunking,
or wholesale interexchange signaling. Some provide all three.
Dial-Tone and Call Origination
Companies that offer dial-tone service or call origination are often called telephone
service providers. Next-generation TSPs are using broadband Internet links to
replace ...
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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.