An open source communications platform, Asterisk® is a complete IP PBX in software. It runs on a wide variety of operating systems including Linux, Mac OS X, OpenBSD, FreeBSD and Sun Solaris and provides all of the features you would expect...
With Skype you can make free calls over the internet to other people on Skype for as long as you like, to wherever you like. It is free to download. You can also call landlines and mobiles at great rates.
Vonage is a leading provider of VoIP internet broadband telephone services. Vonage offers VoIP calling plans to home, residential and business customers who wish to have unlimited long distance with cheap international calling rates.
Cisco 7940/7960 IP phones can support either the Skinny Call Control Protocol (SCCP) to run with Cisco CallManager, the Session Initiation Protocol (SIP) (refer to <XRef URL="http://ftp.isi.edu/in-notes/rfc2543.txt" Exit="yes">RFC 2543), or...
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Power over Ethernet (PoE) is the ability for the LAN switching infrastructure to provide power over a copper Ethernet cable to an endpoint (or powered device).
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