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<DIV>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.</DIV>
<DIV>g-)</DIV>
<DIV> </DIV>
<DIV>---- Original Message ----<BR>From: Richard<BR>To:
serusers@lists.iptel.org<BR>Sent: Thursday, December 02, 2004 10:25 PM<BR>Subject:
[Serusers] nat test based on rfc1918 address in call-id field<BR><BR>>
Hi,<BR>> I am thinking about having more NAT test on a sip packet. Just
want<BR>> to find out if it is useful. <BR>> I run into some situations
that some ‘smart’ UAs try to detect its<BR>> external IP and put the external
IP address into the sip packet.<BR>> Depending on the network and NAT
firewall setup, it may or may not<BR>> set the right external IP and port in
the packet. If it is not, but<BR>> pretends to be on the public internet,
then there is most likely a<BR>> one-way voice or no voice issue. I’d like to
be able to detect and<BR>> force it to use a nat proxy. By checking these
packets, I found that<BR>> the only trace is the private IP address in the
call-id header field.<BR>> It will be useful to check if a RFC1918 address is
used in the<BR>> call-id. I understand that it is not a thorough test for
NAT, well,<BR>> just like any other NAT
test. <BR>> Can someone
please comment if it is a good test?<BR>> Thanks,<BR>> Richard<BR>>
<BR>> <BR>> <BR>>
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