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<DIV><FONT face=Arial size=2>My understanding (by no means
definitive): </FONT></DIV>
<DIV><FONT face=Arial size=2>You need a solution to the NAT problem for the
audio stream. STUN will help with non symmetric NAT but not with symmetric NAT
so it's not a complete solution. If you have UAs behind symmetric NAT you will
need Asterisk or an RTP proxy in the middle of the call.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Regards</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Cameron</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=wsandiford@DURHAMTELECOM.com
href="mailto:wsandiford@DURHAMTELECOM.com">William M. Sandiford</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=asterisk-users@lists.digium.com
href="mailto:asterisk-users@lists.digium.com">asterisk-users@lists.digium.com</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, April 08, 2005 7:57
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [Asterisk-Users] SIP UA behind
NAT and REINVITE ???</DIV>
<DIV><BR></DIV>
<DIV><SPAN class=922315019-07042005><FONT face=Arial
size=2>Hello:</FONT></SPAN></DIV>
<DIV><SPAN class=922315019-07042005><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=922315019-07042005><FONT face=Arial size=2>I've read through
the list archives and found tonnes of threads on this topic but there has been
no definitive answer, so hopefully someone can give me
one.</FONT></SPAN></DIV>
<DIV><SPAN class=922315019-07042005><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=922315019-07042005><FONT face=Arial size=2>Can a proper 2-way
audio call be established when the UA is behind a NAT firewall and REINVITE is
enabled?</FONT></SPAN></DIV>
<DIV><SPAN class=922315019-07042005><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=922315019-07042005><FONT face=Arial size=2>Original Call
Made</FONT></SPAN></DIV>
<DIV><SPAN class=922315019-07042005><FONT face=Arial size=2>SIP UA 1<-->
NAT FIREWALL <---> Asterisk <--> SIP UA 2</FONT></SPAN></DIV>
<DIV><SPAN class=922315019-07042005><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=922315019-07042005><FONT face=Arial size=2>Then REINVITE
occurs and</FONT></SPAN></DIV>
<DIV><SPAN class=922315019-07042005><FONT face=Arial size=2>
<DIV><SPAN class=922315019-07042005><FONT face=Arial size=2>SIP UA 1<-->
NAT FIREWALL <------------------------> SIP UA 2</FONT></SPAN></DIV>
<DIV><SPAN class=922315019-07042005></SPAN> </DIV>
<DIV><SPAN class=922315019-07042005>Is this possible?</SPAN></DIV>
<DIV><SPAN class=922315019-07042005></SPAN> </DIV></FONT></SPAN></DIV>
<DIV><SPAN class=922315019-07042005><FONT face=Arial size=2>Will using a STUN
server help this at all?</FONT></SPAN></DIV>
<DIV><SPAN class=922315019-07042005><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=922315019-07042005><FONT face=Arial size=2>I have tried and
tried and tried to get this working but with no luck (well, I can get it to
work with canreinvite=no, but thats not what I want. I want * out of the
audio path)</FONT></SPAN></DIV>
<DIV><SPAN class=922315019-07042005><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=922315019-07042005><FONT face=Arial size=2>I have even tried
putting the private IP of SIP UA 1 in the DMZ of the NAT Firewall and still no
luck.</FONT></SPAN></DIV>
<DIV><SPAN class=922315019-07042005><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=922315019-07042005><FONT face=Arial size=2>Any
Suggestions???</FONT></SPAN></DIV>
<DIV><SPAN class=922315019-07042005><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=922315019-07042005><FONT face=Arial
size=2>Bill</FONT></SPAN></DIV><BR>
<P><FONT size=2>--<BR>No virus found in this outgoing message.<BR>Checked by
AVG Anti-Virus.<BR>Version: 7.0.308 / Virus Database: 266.9.4 - Release Date:
4/6/2005<BR></FONT></P>
<P>
<HR>
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