<div dir="ltr">This issue occurs when ACK is not routed to proper contact address.</div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Feb 11, 2018 at 6:06 PM, Michael Young <span dir="ltr"><<a href="mailto:myoung@redmonsters.net" target="_blank">myoung@redmonsters.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">And just to add to Alex's comment -- in my experience this is almost always a firewall issue. Whenever I see a call drop in 32 seconds, it is usually because a firewall did not allow the ACK through.<br>
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Google "Asterisk drops calls after 32 seconds" and you get 1,180,000 results... and the problem is not Asterisk itself.<br>
<br>
Michael<br>
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-----Original Message-----<br>
From: sr-users [mailto:<a href="mailto:sr-users-bounces@lists.kamailio.org">sr-users-bounces@<wbr>lists.kamailio.org</a>] On Behalf Of Alex Balashov<br>
Sent: Sunday, February 11, 2018 7:27 PM<br>
To: Kamailio (SER) - Users Mailing List <<a href="mailto:sr-users@lists.kamailio.org">sr-users@lists.kamailio.org</a>><br>
Subject: Re: [SR-Users] Very inconsistent calls<br>
<br>
<br>
<br>
> I have found that calls are very inconsistent. I use Kamailio 5,<br>
> Asterisk 14. When certain Providers like (Sorenson, ZVRS) make calls<br>
> into a WebRTC client (tryit-jssip), sometime the calls stay up until I<br>
> close them (10-15 minutes), others times those calls drop in 30<br>
> seconds. This is extremely confusing...does anyone else experience<br>
> this type of behavior?<br>
<br>
It is hard to speculate without a capture, and indeed there are lots of moving parts with WebRTC. However, the typical reason why an established call would drop after ~30 sec (32, to be precise) is that the end-to-end ACK from the caller, which completes the required "three-way handshake"<br>
for call establishment, does not reach the callee. This is because it's not constructed correctly by the calling UA, not routed correctly by intermediate entities, or isn't sent at all by the calling UA.<br>
<br>
--<br>
Alex Balashov | Principal | Evariste Systems LLC<br>
<br>
Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)<br>
Web: <a href="http://www.evaristesys.com/" rel="noreferrer" target="_blank">http://www.evaristesys.com/</a>, <a href="http://www.csrpswitch.com/" rel="noreferrer" target="_blank">http://www.csrpswitch.com/</a><br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr">Sincerely,<div>Brandon Armstead</div><div>CTO / CRYY.com</div></div></div>
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