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	<title>Sekiur My Thoughts &#187; fw-1</title>
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	<description>VoIP, Mobility, Security, Open Source, Science, Politics, and Technology.</description>
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		<title>Checkpoint Firewall-1 and The SIP Protocol</title>
		<link>http://blog.sekiur.com/2008/12/checkpoint-firewall-1-and-the-sip-protocol/</link>
		<comments>http://blog.sekiur.com/2008/12/checkpoint-firewall-1-and-the-sip-protocol/#comments</comments>
		<pubDate>Tue, 30 Dec 2008 06:58:38 +0000</pubDate>
		<dc:creator>Jose Vicente Ortega</dc:creator>
				<category><![CDATA[Security]]></category>
		<category><![CDATA[asterisk]]></category>
		<category><![CDATA[checkpoint]]></category>
		<category><![CDATA[firewall-1]]></category>
		<category><![CDATA[fw-1]]></category>
		<category><![CDATA[sip]]></category>
		<category><![CDATA[voip]]></category>

		<guid isPermaLink="false">http://blog.sekiur.com/?p=669</guid>
		<description><![CDATA[You have an asterisk based VoIP phone system sitting on an internal network and you are trying to establish connectivity to a SIP-based trunk provider. You configure a static NAT entry 1-to-1 for the asterisk box and allow the SIP (udp 5060) through the firewall, but SIP registration fails constantly. While troubleshooting the issue you [...]]]></description>
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