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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Assuming the SD is configured to do NAT traversal, my guess
would be that the ALG on the fire wall is not completely off. In such case ACME
would think that some other device is addressing the NAT traversal issue
and would register the user agent as a non HNT device. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Checking the registration on the SD would confirm whether my
guess is true or not. Run the command: “show registration sipd by-user <endpoint>
detail<br>
If you see a line including “acme_nat=…….” Under “User
Agent Info:”, it means that the endpoint registered as an HNT device. Good
luck,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:blue'>Brad</span></b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p></o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
voiceops-bounces@voiceops.org [mailto:voiceops-bounces@voiceops.org] <b>On
Behalf Of </b>milosz<br>
<b>Sent:</b> Friday, October 02, 2009 4:09 PM<br>
<b>To:</b> VoiceOps<br>
<b>Subject:</b> [VoiceOps] acme nat traversal clue<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>hi guys,<br>
<br>
need a bit of help... have never touched an acme before so i'm not sure what to
tell the people i am dealing with, and they seem incapable of resolving the
problem themselves. trying to explain the difference between layer 3 and
layer 7 is not working.<br>
<br>
setup: i have an ip pbx with a single interface at 10.0.1.80, and a netscreen
50 with a static routable ip natted to the pbx at 1.1.1.1 (sip alg is
off). my itsp has an acme at 2.2.2.2.<br>
<br>
this is what an inbound call looks like right now:<br>
<br>
2.2.2.2 -> 1.1.1.1 invite <a href="mailto:sip%3Axxxxxx@1.1.1.1">sip:xxxxxx@1.1.1.1</a><br>
10.0.1.80 -> 2.2.2.2 100 trying<br>
10.0.1.80 -> 2.2.2.2 200 ok (contact: <a href="mailto:sip%3Axxxxxx@10.0.1.80">sip:xxxxxx@10.0.1.80</a>)<br>
2.2.2.2 -> 10.0.1.80 ack <a href="mailto:sip%3Axxxxxx@10.0.1.80">sip:xxxxxx@10.0.1.80</a><br>
<br>
so obviously it breaks at this point.<br>
<br>
according to them, they are unable to configure the acme to respond to the
originating routable ip instead of the nonroutable ip in the sip contact.<br>
<br>
this is what someone at acme told them:<o:p></o:p></p>
<p><span style='font-size:11.0pt;color:#1F497D'>It’s not a configuration
issue, the endpoint at 1.1.1.1 has set it’s contact header address to
10.0.1.80 in it’s 200 OK response back to 2.2.2.2 (SBC). The SD will look
at the Contact header in order to determine where to send future in-dialog
requests such as ACK, BYE, Re-INVITEs etc (according to RFC3261). Please can
you check why 1.1.1.1 would be doing so?</span><o:p></o:p></p>
<p>this sounds irrelevant to me, since any sip endpoint will set its contact
header address to its own ip. sounds like this guy is saying "well
it's natted so that won't work, tell them to fix it." i certainly
can't configure my pbx to respond with a modified contact header.<o:p></o:p></p>
<p>can anyone provide some guidance here? or maybe i am just wrong and it
is impossible to make this work. but it looks like a basic hnt situation
to me.<o:p></o:p></p>
<p>thanks,<o:p></o:p></p>
<p>milosz<o:p></o:p></p>
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