If I understand you correctly, you are talking about test 16 found in nathelper cvs. You may want to have a look at that test first.   You call nat_uac-test("19") to trigger the test.

g-)

 

---- Original Message ----
From: Richard
To: serusers@lists.iptel.org
Sent: Thursday, December 02, 2004 10:25 PM
Subject: [Serusers] nat test based on rfc1918 address in call-id field

> Hi,
> I am thinking about having more NAT test on a sip packet. Just want
> to find out if it is useful.
> I run into some situations that some ‘smart’ UAs try to detect its
> external IP and put the external IP address into the sip packet.
> Depending on the network and NAT firewall setup, it may or may not
> set the right external IP and port in the packet. If it is not, but
> pretends to be on the public internet, then there is most likely a
> one-way voice or no voice issue. I’d like to be able to detect and
> force it to use a nat proxy. By checking these packets, I found that
> the only trace is the private IP address in the call-id header field.
> It will be useful to check if a RFC1918 address is used in the
> call-id. I understand that it is not a thorough test for NAT, well,
> just like any other NAT test.         
> Can someone please comment if it is a good test?
> Thanks,
> Richard
>
>
>
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