<a href="http://www.gnu.org/software/sipwitch/">http://www.gnu.org/software/sipwitch/</a><div><br><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><span class="Apple-style-span" style="font-family: arial, helvetica, clean, sans-serif; line-height: 20px; color: rgb(53, 56, 42); font-size: 16px; ">"GNU SIP Witch can be used to build secure and intercept-free telephone systems that can operate over the public Internet."</span></div>
<div><font class="Apple-style-span" color="#35382a" face="arial, helvetica, clean, sans-serif" size="3"><span class="Apple-style-span" style="line-height: 20px;"><br></span></font><div class="gmail_quote">---------- Forwarded message ----------<br>
From: <b class="gmail_sendername">S</b><br>Date: Mon, Aug 22, 2011 at 1:58 AM<br>Subject: GNU Free Call: An Open Source Skype Alternative<br>To: <br><br><br><a href="http://www.pcworld.com/businesscenter/article/222556/gnu_free_call_an_open_source_skype_alternative.html" target="_blank">http://www.pcworld.com/businesscenter/article/222556/gnu_free_call_an_open_source_skype_alternative.html</a><br>
<br><p><strong>The SIP Protocol</strong></p>
<p>To make all that possible, GNU Free Call will use the <a href="http://en.wikipedia.org/wiki/Session_Initiation_Protocol" target="_blank">Session Initiation Protocol</a> (SIP), an Application Layer signaling protocol that's designed to be independent of the underlying transport layer.</p>
<p>Specifically, it will build upon the existing <a href="http://www.gnu.org/software/sipwitch/" target="_blank">GNU SIP Witch</a>
VoIP server, which operates without introducing a central point through
which communications can be intercepted or captured. GNU SIP Witch also
requires minimal system resources, making it suitable even for low-end
embedded routers.</p>
<p>GNU SIP Witch is already packaged in a number of popular Linux distributions, including <a href="http://www.pcworld.com/businesscenter/article/221517/work_begins_on_ubuntu_1110_oneiric_ocelot.html" target="_blank">Ubuntu</a> and Fedora, but it can also be built on most BSD systems from source, and it supports compilation on <a href="http://www.pcworld.com/businesscenter/article/207196/why_windows_is_bad_for_business.html" target="_blank">Microsoft Windows</a> as well, according to the GNU Free Call project.</p>
<p style="color:rgb(204, 0, 0)">"We will extend SIP Witch to become aware of peer nodes by
supporting host caches, and then support publishing of routes to
connected peers," the project explains. Host caches are a mechanism used
in older P2P networks and are easy to implement, it adds.</p><br>
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