[Freeswitch-users] Call quality issues

[Michael Collins]

On Thu, Apr 28, 2011 at 2:52 PM, Eric Beard <eric at loopfx.com> wrote:

> Hello,
>
>
>
> 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.
>
>
>
> I have tested against multiple gateways, same results against each, so it’s
> not an issue with the gateway.
>
>
>
> 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.
>
>
>
> One sample call showed:
>
>
>
> Drop by Jitter Buff:158(14.1%) Out of Seq 0 (0.0%) Wrong Timestamp 96(8.6%)
>

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.
-MC
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