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<font face="Times New Roman" size="3"><span style="font-size:12pt;"><a name="_MailEndCompose"></a>
<div><font face="Arial" size="2" color="#2F5496"><span style="font-size:10.5pt;">Hi,</span></font></div>
<div><font face="Arial" size="2" color="#2F5496"><span style="font-size:10.5pt;"> </span></font></div>
<div><font face="Arial" size="2" color="#2F5496"><span style="font-size:10.5pt;">Do you need further information? Actually, I am not sure if the process is normal, there‘s no problem with the call at least.</span></font></div>
<div><font face="Arial" size="2" color="#2F5496"><span style="font-size:10.5pt;">Could it be caused any problem if all clients do fix_nated_register?</span></font></div>
<div><font size="3" color="#2F5496"><span style="font-size:12pt;"> </span></font></div>
<div><font size="3" color="#1F497D"><span style="font-size:12pt;"> </span></font></div>
<div><font face="Arial" size="2" color="#1F497D"><span style="font-size:10.5pt;">Best Regards,</span></font></div>
<div><font face="Arial" size="2" color="#1F497D"><span style="font-size:10.5pt;">Rex </span></font></div>
<div><font size="3" color="#2F5496"><span style="font-size:12pt;"> </span></font></div>
<div><font face="Calibri" size="2"><span style="font-size:11pt;"><b>From:</b> Rex Lin (<font face="新細明體">林昱頡</font>)
<br>
<b>Sent:</b> Friday, May 15, 2020 2:37 PM<br>
<b>To:</b> Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org><br>
<b>Subject:</b> Re: [SR-Users] Issue of calls drop 32s</span></font></div>
<div><font size="3"><span style="font-size:12pt;"> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">Hi Alex,</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;"> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">Thanks for your reply.</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">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.</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;"> </span></font></div>
<div><font size="3"><span style="font-size:12pt;"><img src="cid:7671242CA12895489E913CE7205EFDE8@apcprd04.prod.outlook.com"><font face="Calibri"> </font></span></font></div>
<div><font size="3"><span style="font-size:12pt;"> </span></font></div>
<div><font size="3"><span style="font-size:12pt;"> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">Best Regards,</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">Rex</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;"> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">-----Original Message-----<br>
From: sr-users <<a href="mailto:sr-users-bounces@lists.kamailio.org"><font color="#0563C1"><u>sr-users-bounces@lists.kamailio.org</u></font></a>> On Behalf Of Alex Balashov<br>
Sent: Thursday, May 14, 2020 12:18 AM<br>
To: Kamailio (SER) - Users Mailing List <<a href="mailto:sr-users@lists.kamailio.org"><font color="#0563C1"><u>sr-users@lists.kamailio.org</u></font></a>><br>
Subject: Re: [SR-Users] Issue of calls drop 32s</span></font></div>
<div><font size="3"><span style="font-size:12pt;"> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">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).</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;"> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">-- Alex</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;"> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">On Wed, May 13, 2020 at 04:07:16PM +0000, Rex Lin (<font face="新細明體">林昱頡</font>) wrote:</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;"> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> Hi,</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> It<font face="Courier New">’</font>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.</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> Moreover, I cannot see <font face="Courier New">“</font>Received<font face="Courier New">”</font> in AOR as the callee finish the registration.</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> I recognized it<font face="Courier New">’</font>s marked by nat_uac_test(<font face="Courier New">“</font>19<font face="Courier New">”</font>) and set with fix_nated_register(), the problem
can be resolved.</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> My scenario is as below, for your reference.</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> 1.Kamailio version is 4.4.7, listening public ip.</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> 2.Caller it<font face="Courier New">’</font>s behind NAT.</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> 3.Clients of Linphone.</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> Do you know the reason why it happened?</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> Best Regards,</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> Rex</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;"> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> _______________________________________________</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> Kamailio (SER) - Users Mailing List</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> <a href="mailto:sr-users@lists.kamailio.org">sr-users@lists.kamailio.org</a></span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">> <a href="https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users">https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users</a></span></font></div>
<div><font size="3"><span style="font-size:12pt;"> </span></font></div>
<div><font size="3"><span style="font-size:12pt;"> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">--</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">Alex Balashov | Principal | Evariste Systems LLC</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;"> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">Web: <a href="http://www.evaristesys.com/">http://www.evaristesys.com/</a>, <a href="http://www.csrpswitch.com/">http://www.csrpswitch.com/</a></span></font></div>
<div><font size="3"><span style="font-size:12pt;"> </span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">_______________________________________________</span></font></div>
<div><font face="Calibri" size="3"><span style="font-size:12pt;">Kamailio (SER) - Users Mailing List</span></font></div>
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