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padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://electronics.howstuffworks.com/ip-telephony4.htm"><table background="undefined" bgcolor=""><tr><TD width="440" valign="top"><DIV class="articleBody"> <P> <FONT size="+1" color="%23000099">Related HowStuffWorks Articles</FONT> </P><UL> <li style="margin-left:16px;padding-left: 0px;"><A href="http://electronics.howstuffworks.com/telephone.htm">How Telephones Work</A> </LI><li style="margin-left:16px;padding-left: 0px;"><A href="http://electronics.howstuffworks.com/cell-phone.htm">How Cell Phones Work</A> </LI><li style="margin-left:16px;padding-left: 0px;"><A href="http://electronics.howstuffworks.com/web-server.htm">How Web Servers Work</A> </LI><li style="margin-left:16px;padding-left: 0px;"><A href="http://electronics.howstuffworks.com/home-network.htm">How Home Networking Works</A> </LI><li style="margin-left:16px;padding-left: 0px;"><A href="http://electronics.howstuffworks.com/internet-infrastructure.htm">How Internet Infrastructure Works</A> </LI><li style="margin-left:16px;padding-left: 0px;"><A href="http://electronics.howstuffworks.com/router.htm">How Routers Work</A> </LI><li style="margin-left:16px;padding-left: 0px;"><A href="http://electronics.howstuffworks.com/speaker.htm">How Speakers Work</A> </LI><li style="margin-left:16px;padding-left: 0px;"><A href="http://electronics.howstuffworks.com/sound-card.htm">How Sound Cards Work</A> </LI><li style="margin-left:16px;padding-left: 0px;"><A href="http://electronics.howstuffworks.com/modem.htm">How Modems Work</A> </LI><li style="margin-left:16px;padding-left: 0px;"><A href="http://electronics.howstuffworks.com/cable-modem.htm">How Cable Modems Work</A> </LI><li style="margin-left:16px;padding-left: 0px;"><A href="http://electronics.howstuffworks.com/dsl.htm">How DSL Works</A> </LI></UL> <UL> <P> <FONT size="+1" color="%23000099">Sponsored Links</FONT> </P><P> </P><li style="margin-left:16px;padding-left: 0px;"><A href="http://www.voipreview.org">VoIP forum</A> </LI><li style="margin-left:16px;padding-left: 0px;"><A href="http://www.voiplink.com/Cheap_Digium_Cards_For_Asterisk_s/20.htm">Buy Digium for Asterisk</A> </LI><li style="margin-left:16px;padding-left: 0px;"><A href="http://www.inphonex.com">VoIP Phone Service Provider and Free PC Calls</A> </LI><li style="margin-left:16px;padding-left: 0px;"><A href="http://www.voip-news.com">VoIP</A> <P> </P></LI></UL> <TABLE width="100%" cellspacing="0" cellpadding="0" border="0"><TBODY><TR><TD><FONT size="+1" color="%23000099">More Great Links</FONT><BR /></TD><TD align="right"><A href="http://electronics.howstuffworks.com/contact.php?s=hsw%26ct=addlink"><IMG width="221" height="30" border="0" src="http://static.howstuffworks.com/gif/addlink_button.gif" /></A></TD></TR></TBODY></TABLE><UL> <li style="margin-left:16px;padding-left: 0px;"><A target="_blank" href="http://computer.howstuffworks.com/framed.htm?parent=ip-telephony.htm%26url=http://www.fokus.gmd.de/research/cc/glone/projects/ipt/">iptel.org: On-line Reference for Internet Telephony</A> </LI><li style="margin-left:16px;padding-left: 0px;"><A target="_blank" href="http://computer.howstuffworks.com/framed.htm?parent=ip-telephony.htm%26url=http://www.cisco.com/univercd/cc/td/doc/product/software/ios113ed/113t/113t_1/voip/config.htm">Cisco.com: Configuring VoIP for the Cisco 3600 Series</A> </LI><li style="margin-left:16px;padding-left: 0px;"><A target="_blank" href="http://computer.howstuffworks.com/framed.htm?parent=ip-telephony.htm%26url=http://protocols.com/pbook/h323.htm">Protocols.com: H.323 Protocol</A> </LI><li style="margin-left:16px;padding-left: 0px;"><A target="_blank" href="http://computer.howstuffworks.com/framed.htm?parent=ip-telephony.htm%26url=http://www.voip-calculator.com/">VoIP Calculator</A> </LI><li style="margin-left:16px;padding-left: 0px;"><A target="_blank" href="http://computer.howstuffworks.com/framed.htm?parent=ip-telephony.htm%26url=http://www.cs.columbia.edu/sip/">Columbia.edu: Session Initiation Protocol (SIP)</A> </LI></UL> <P> <FONT color="%23000099"><FONT size="-1">Sources</FONT></FONT> </P><UL><FONT size="-1"> <li style="margin-left:16px;padding-left: 0px;">An Interview with Andy Melton of NOS Communications </LI><li style="margin-left:16px;padding-left: 0px;"><A target="_blank" href="http://electronics.howstuffworks.com/framed.htm?parent=ip-telephony.htm%26url=http://www.pcworld.com/howto/article/0%2Caid%2C116188%2Cpg%2C1%2C00.asp">PC World: Avoid VoIP Gotchas by James A. 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