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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Tahoma",sans-serif;color:#737373">I already know that if not SRTP then FS has no problem with the load. I have no experience with rtpengine, so this brinngs in a new piece that I would also need
to load test before sliding into production. I may just have to bring up some FS servers in the cloud and use them to generate load SRTP traffic unless someone has a better idea…</span><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><b>From:</b> FreeSWITCH-users [mailto:freeswitch-users-bounces@lists.freeswitch.org]
<b>On Behalf Of </b>Richard Chan<br>
<b>Sent:</b> Tuesday, October 31, 2017 11:20 AM<br>
<b>To:</b> FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org><br>
<b>Subject:</b> Re: [Freeswitch-users] SRTP scaling issues<o:p></o:p></p>
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<p class="MsoNormal">Just an idea: to isolate you use something else just to offload SRTP: e.g use rtpengine for SRTP/RTP bridging. This could show whether FreeSWITCH+SRTP is really to blame. You could even run rtpengine on the same box as FreeSWITCH since
the CPU load looks manageable.<o:p></o:p></p>
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<p class="MsoNormal">Media path would look like:<o:p></o:p></p>
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<p class="MsoNormal">webrtc --[SRTP] -- (rtpengine+kamailio-to-rewrite-SDP) --[ RTP] -- FreeSWITCH<o:p></o:p></p>
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<p class="MsoNormal">On Tue, Oct 31, 2017 at 4:37 AM, Matthew Meek <<a href="mailto:mmeek@livexchange.com" target="_blank">mmeek@livexchange.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">We have been using Freeswitch as our SBC and core switch for many years without issues. Recently we added public facing softphones using an additional server running Kamailio as
TLS and webrtc bridge with FS handling media back to our core FS farm. We run a mix of webrtc and Zoiper softphones. All running SIPS (tls) but webrtc is SRTP (PCMU) and Zoiper is RTP (PCMU).
<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">We have been ramping up the webrtc traffic and at some magic point at busy times (~150 concurrent calls) the RTT and Packet loss for the webrtc calls goes crazy (as measured in
the browser via RTCP and captured back on our logging servers). RTT jumps from 100ms to 2-3 seconds for most or all webrtc users and packet loss jumps from nothing to troubling on the Sending side back to FS only. Packets received are not an issue on webrtc
side… webrtc can hear end caller, but end caller cannot hear webrtc well. Non webrtc traffic (Zoiper) have no reported impact. Server CPU (dual socket 6 core) looks great (no core over 20%) according to nmon… packets per second within reason (10Gb NICs).<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I am assuming the SRTP has some hidden scaling issue since this is the only difference between the two types of softphones. Has anyone seen this or have a workaround?
<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I am at a loss. I assume if it is encryption overhead the CPU would be saturated and it is not. Why a single direction of SRTP traffic is impacted has me up late at night.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">A side note… does anyone know of a SIPP replacement that does SRTP so I can test load against this to isolate?
<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">Thanks,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">Matthew Meek</span><o:p></o:p></p>
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<p class="MsoNormal"><br>
_________________________________________________________________________<br>
Professional FreeSWITCH Consulting Services:<br>
<a href="mailto:consulting@freeswitch.org">consulting@freeswitch.org</a><br>
<a href="http://www.freeswitchsolutions.com" target="_blank">http://www.freeswitchsolutions.com</a><br>
<br>
Official FreeSWITCH Sites<br>
<a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
<a href="http://confluence.freeswitch.org" target="_blank">http://confluence.freeswitch.org</a><br>
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<br>
FreeSWITCH-users mailing list<br>
<a href="mailto:FreeSWITCH-users@lists.freeswitch.org">FreeSWITCH-users@lists.freeswitch.org</a><br>
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UNSUBSCRIBE:<a href="http://lists.freeswitch.org/mailman/options/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/options/freeswitch-users</a><br>
<a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Droid Sans",serif;color:black">Richard Chan</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Droid Sans",serif;color:black">Chief Architect</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Droid Sans",serif;color:black">TreeBox Solutions Pte Ltd</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Droid Sans",serif;color:black">1 Commonwealth Lane #03-01</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Droid Sans",serif;color:black">Singapore 149544</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Droid Sans",serif;color:black">Tel: 6570 3725</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Droid Sans",serif;color:black"><a href="http://www.treeboxsolutions.com" target="_blank">http://www.treeboxsolutions.com</a></span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Droid Sans",serif;color:black"><a href="http://Co.Reg.No" target="_blank">Co.Reg.No</a>. 201100585R
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