From mboxrd@z Thu Jan  1 00:00:00 1970
From: whiplash <whiplash@bofhland.org>
Subject: Re: SIP services
Date: Tue, 03 Jun 2008 19:07:07 +0200
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marcos ha scritto:
> Hi list memembers,  i need to conect a  sip-pabx  micronet  sp5211 to inet ,
> it is behind  a  linux box with 2 networks cards , the former eth0  access
> to internet  , the  second  eth1 connects to lan, i am trying to use dnat to
> accept sip connection from internet  ,  but DNAT doesn't work

You need th SIP conntrack module.
It used to be in patch-o-matic, for older kernels.