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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Two things I would try
<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="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Point the phone to alternate port (5090) . You will need a realm configured on the HNT SBC to accept 5090<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Downgrade the phone firmware<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>
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<p class="MsoNormal" style="line-height:115%"><b><span style="font-family:"Arial","sans-serif";color:#1F497D">Kumudu Suriyaarachchi
</span></b><i><span style="font-size:10.0pt;line-height:115%;font-family:"Arial","sans-serif";color:#3399FF"><a href="mailto:ksuriyaarachchi@alteva.com"><span style="color:blue">ksuriyaarachchi@alteva.com</span></a></span></i><i><span style="font-size:10.0pt;line-height:115%;font-family:"Arial","sans-serif";color:blue">
</span></i><b><span style="font-size:10.0pt;line-height:115%;font-family:"Arial","sans-serif";color:#1F497D"><o:p></o:p></span></b></p>
<p class="MsoNormal" style="line-height:115%"><b><span style="font-size:10.0pt;line-height:115%;font-family:"Arial","sans-serif";color:#4F81BD">P</span></b><span style="font-size:10.0pt;line-height:115%;font-family:"Arial","sans-serif";color:gray"> 484.534.4427
<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:115%"><span style="font-family:"Arial","sans-serif";color:#1F497D"><img border="0" width="96" height="35" id="Picture_x0020_1" src="cid:image001.gif@01D10068.EEB408F0" alt="Alteva-Logo-horizontal"></span><span style="font-size:11.0pt;line-height:115%;font-family:"Arial","sans-serif";color:#1F497D"><o:p></o:p></span></p>
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<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"><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:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> VoiceOps [mailto:voiceops-bounces@voiceops.org]
<b>On Behalf Of </b>Pete E<br>
<b>Sent:</b> Tuesday, October 06, 2015 5:10 PM<br>
<b>To:</b> voiceops@voiceops.org<br>
<b>Subject:</b> [VoiceOps] Cisco 7941 SIP<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Greetings Voice Operators,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">We have an interesting (code word for annoying) challenge that we've never dealt with before, probably because we don't do much with Cisco phones. We have a new customer coming on who wants to keep their very old Cisco 7941 phones. They
have a few offices and the phones work as expected behind an Edgemarc. However, they also have 100+ home users, and that's where the issue comes in.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Apparently Cisco introduced a security "feature" where they create the session using a random high numbered port (e.g. 49123) but in the Via header, they say to respond to
<b>private IP, port 5060</b>. So when the SBC sees the private address it assumes it is being NAT'd through a firewall and replies back to
<b>public IP, port 49123</b>. What we're seeing is that the home router passes the response back to
<b>private IP, port 49123</b>, which the phone doesn't accept (because it wants it on 5060) and the REGISTER fails.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">As you know most home routers are poor at handling ALG (and we've tested and found they are equally bad at handling this scenario). We (and the customer) don't want to troubleshoot 100+ individual home routers. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">We haven't found a way to turn off this really awesome "feature" so we're trying to find other solutions. Anyone been through this and have any suggestions?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks,<o:p></o:p></p>
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<p class="MsoNormal">Pete<o:p></o:p></p>
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