<br><br><div class="gmail_quote">On Thu, Apr 28, 2011 at 2:52 PM, Eric Beard <span dir="ltr"><<a href="mailto:eric@loopfx.com">eric@loopfx.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal">Hello,</p><p class="MsoNormal"> </p><p class="MsoNormal">I ran into some major call quality issues this week, and I’m trying to figure out how to troubleshoot things. I’ve been running FreeSwitch for a few weeks, and suddenly a few days ago my call quality dropped drastically. I had been running more than 100 concurrent calls, with the CPU at less than 20%, but now at 20 concurrent calls, the CPU is still at a little less than 20%, and the call quality is bad – any higher and calls go almost completely silent. There is a direct correlation between the number of simultaneous calls and call quality.</p>
<p class="MsoNormal"> </p><p class="MsoNormal">I have tested against multiple gateways, same results against each, so it’s not an issue with the gateway.</p><p class="MsoNormal"> </p><p class="MsoNormal">I have captured packets on the machine and analyzed them with Wireshark. It seems like the inbound packets are all fine, no jitter or loss. But the packets being sent by FreeSwitch are degraded.</p>
<p class="MsoNormal"> </p><p class="MsoNormal">One sample call showed:</p><p class="MsoNormal"> </p><p class="MsoNormal">Drop by Jitter Buff:158(14.1%) Out of Seq 0 (0.0%) Wrong Timestamp 96(8.6%)</p></div></div></blockquote>
<div><br></div><div>What is the topology of the network path for the above call? Also, where on the LAN/WAN did you capture these packets? Wrong timestamps and 14% dropped packets suggests that something on the network is interfering with the delivery of these packets in a timely manner.</div>
<div>-MC</div><div><br></div></div>