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Date:	Mon, 30 Nov 2009 11:13:55 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Patrick McHardy <kaber@...sh.net>
cc:	Christian Hentschel <chentschel@...et.com.ar>,
	netdev@...r.kernel.org
Subject: SIP proxying: siproxd vs. Netfilter SIP nat

It seems that the current sip nat module in the kernel has only limited
functionality. According to

http://people.netfilter.org/chentschel/docs/sip-conntrack-nat.html

one has to point the firewall at the target host for the SIP proxying to
work. Therefore the kernel will only support a single inside phone
connecting via SIP to the outside. For a network that has a series of
phones inside the NAT zones this means that the firewall sip nat is not
useful.

siproxd http://siproxd.sourceforge.net/ seems to be able to handle
multiple outgoing SIP connections but one needs to specify an outbound
proxy for each inside SIP phone.

Isnt there a way to make the kernel module work in the same way siproxd
works and able to support multiple phones? Right now configuring SIP
connectivity is a messy thing that is not easily setup. Can we fix this?


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