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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";
color:#1F497D">Try add ‘sip-force-contact’ to your user<o:p></o:p></span></p>
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color:#1F497D"><variable name="sip-force-contact" value="NDLB-connectile-dysfunction"/><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:SimSun">发件人<span lang="EN-US">:</span></span></b><span lang="EN-US" style="font-size:10.0pt;
font-family:SimSun"> freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org]
</span><b><span style="font-size:10.0pt;font-family:SimSun">代表 </span></b><span lang="EN-US" style="font-size:10.0pt;font-family:SimSun">Oleg Stolyar<br>
</span><b><span style="font-size:10.0pt;font-family:SimSun">发送时间<span lang="EN-US">:</span></span></b><span lang="EN-US" style="font-size:10.0pt;
font-family:SimSun"> 2013</span><span style="font-size:10.0pt;font-family:SimSun">年<span lang="EN-US">6</span>月<span lang="EN-US">4</span>日<span lang="EN-US">
4:32<br>
</span><b>收件人<span lang="EN-US">:</span></b><span lang="EN-US"> FreeSWITCH Users Help<br>
</span><b>主题<span lang="EN-US">:</span></b><span lang="EN-US"> [Freeswitch-users] Issue with changing phone SIP port<o:p></o:p></span></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Hi guys,<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">I ran into the following problem recently:<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Using a softphone from a computer behind a NAT I register it with FreeSWITCH.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">It registers with a certain port in the Contact header. FreeSWITCH stores this port in the user's registration info and uses it from then on to send messages to the phone.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">However, for some reason FreeSWITCH initially sends back an "Unauthorized" response. After that some phones seem to send REGISTER again but with a<b> different port</b>.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">This only happen if the phone is behind a NAT. If FreeSWITCH is on the same network as the phone, the phone keeps the same port.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">FreeSWITCH ignores that and keeps trying to contact the phone on the old port and of course fails.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Only some phones seem to change their port after registration. They include 3CXPhone, X-Lite.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Phones that don't do this are MicroSIP and Mizu.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">I have a wireshark capture file of the session from the softphone machine if anyone would like, I'll be happy to email it or publish it.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">So, I have three questions:<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">1. Why does FreeSWITCH initially send "Unauthorized" reply?<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">2. Does anyone know why some phones change their port during registration from behind a NAT? <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">3. Should I file a Jira ticket to have FreeSWITCH change UA's registered contact info when the UA sends a message with a different Contact header?<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><br clear="all">
<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Thank you<o:p></o:p></span></p>
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<p class="MsoNormal"><i><span lang="EN-US" style="color:blue">Oleg</span></i><span lang="EN-US"><o:p></o:p></span></p>
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