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<p class=MsoNormal><span lang=EN-US>Hi everyone, <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I have a little issue with one of my customers:
Since some months they are using NAT with a Cisco7301 router in order to
translate ATA ip addresses from an internal network to a public address (PAT is
used). These ATA are registering to an external SIP server according to this scenario:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>ATA-----------Cisco7301_with_NAT_(LNS)------------Sip_Server</span><span
lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>The strange thing is that it was working
properly during many months but when the number of the registered ATA boxes
reached 42, some problems has been met => The ATA boxes could not automatically
register although there is an entry in the translation table for these ATA.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>The only way to make new ATA box to
register is deleting its entry in the nat table and reboot it.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US>The ‘debug
ip nat sip’ let us think the NAT is done correctly and in a wireshark
capture we can see SIP 406 </span><span lang=EN-US>Not Acceptable answers to
the registration request.<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US>SIP 406 </span><span
lang=EN-US>Not Acceptable :<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:9.0pt;font-family:"Courier New"'>This response indicates that
the requested resource is capable of generating only responses that have
content characteristics not acceptable as specified in the accept header of the
request. The SIP gateway does not generate this response. After receiving this
response, the gateway initiates a graceful call disconnect and clears the call.<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-US
style='font-size:8.0pt;font-family:"Z@R1ECE.tmp","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Do you know if there is any restriction or
limitation regarding the number of SIP sessions supported by the NAT? I made
some bugs researches but I did not manage to hit one?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I think I will open a TAC case but if
someone has ever met this symptom it would be great. If not I will share the
TAC case conclusion if we fix this issue.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>7301 IOS is c7301-spservicesk9-mz.124-15.T4.bin<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Thank you very much for your ideas.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:gray'>K. Rahmani</span></b><br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:gray'>Support
Client , Telindus France<br>
10 , avenue de Norvège , ZA de Courtaboeuf 1 BP 742</span><b><br>
</b><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:gray'>91962 Les Ulis cedex France</span></b><u><br>
</u><a href="blocked::BLOCKED::mailto:karim.rahmani@telindus.fr"><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'>Mailto:karim.rahmani@telindus.fr</span></a><b><br>
</b><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Telindus.
Change things your way.</span></b> <a
href="blocked::BLOCKED::http://www.telindus.fr/"><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:blue'>http://www.telindus.fr</span></a><b><br>
<br>
</b><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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