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<p class="MsoPlainText"><span lang="EN-US">Hi Alex,<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks for your reply.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">ICE/STUN haven’t been activated by our clients. All transmission traffic pass through a proxy server. Below is the screenshot of a normal call process.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><img width="1152" height="982" style="width:12.0in;height:10.2291in" id="圖片_x0020_2" src="cid:image001.png@01D62AC5.FBF723D0"><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">Best Regards,<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">Rex<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">-----Original Message-----<br>
From: sr-users <sr-users-bounces@lists.kamailio.org> On Behalf Of Alex Balashov<br>
Sent: Thursday, May 14, 2020 12:18 AM<br>
To: Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org><br>
Subject: Re: [SR-Users] Issue of calls drop 32s<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">It's a tell-tale sign of an end-to-end ACK from the caller not being forwarded properly to the callee. The server should not be forwarding such an ACK "to itself"; this suggests that its Request URI may be improperly
constructed (it should be equivalent to the remote Contact URI of the callee in the 200 OK message), or that its Route headers are somehow incorrect (they should mirror the Record-Route set in the 200 OK).<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">-- Alex<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">On Wed, May 13, 2020 at 04:07:16PM +0000, Rex Lin (</span><span style="font-family:"新細明體",serif">林昱頡</span><span lang="EN-US">) wrote:<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> Hi,<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> It</span><span lang="EN-US" style="font-family:"Courier New"">’</span><span lang="EN-US">s weird that the calls always drop after 32s while the callee is using public ip. Also, Server forwards ACK to itself with
UDP, instead of forwarding to callee with TLS.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> Moreover, I cannot see </span><span lang="EN-US" style="font-family:"Courier New"">“</span><span lang="EN-US">Received</span><span lang="EN-US" style="font-family:"Courier New"">”</span><span lang="EN-US"> in AOR
as the callee finish the registration.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> I recognized it</span><span lang="EN-US" style="font-family:"Courier New"">’</span><span lang="EN-US">s marked by nat_uac_test(</span><span lang="EN-US" style="font-family:"Courier New"">“</span><span lang="EN-US">19</span><span lang="EN-US" style="font-family:"Courier New"">”</span><span lang="EN-US">)
and set with fix_nated_register(), the problem can be resolved.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> My scenario is as below, for your reference.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> 1.Kamailio version is 4.4.7, listening public ip.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> 2.Caller it</span><span lang="EN-US" style="font-family:"Courier New"">’</span><span lang="EN-US">s behind NAT.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> 3.Clients of Linphone.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> Do you know the reason why it happened?<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> Best Regards,<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> Rex<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> _______________________________________________<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> Kamailio (SER) - Users Mailing List<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> <a href="mailto:sr-users@lists.kamailio.org">
<span style="color:windowtext;text-decoration:none">sr-users@lists.kamailio.org</span></a><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> <a href="https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users">
<span style="color:windowtext;text-decoration:none">https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users</span></a><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">--<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">Alex Balashov | Principal | Evariste Systems LLC<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">Web: <a href="http://www.evaristesys.com/">
<span style="color:windowtext;text-decoration:none">http://www.evaristesys.com/</span></a>,
<a href="http://www.csrpswitch.com/"><span style="color:windowtext;text-decoration:none">http://www.csrpswitch.com/</span></a><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">_______________________________________________<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">Kamailio (SER) - Users Mailing List<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><a href="mailto:sr-users@lists.kamailio.org"><span style="color:windowtext;text-decoration:none">sr-users@lists.kamailio.org</span></a><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><a href="https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users"><span style="color:windowtext;text-decoration:none">https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users</span></a><o:p></o:p></span></p>
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