[Freeswitch-users] RTP packet loss on outgoing streams

[Brian West]

Where are you capturing this data? ON the system itself? or some other
point in the network?

On Fri, Apr 17, 2015 at 10:01 AM, mbo <mbodbg at gmx.net> wrote:

> Hello,
>
> we need to monitor the voice quality on our server. To test this, we setup
> a test environment with 2 freeswitches, originating calls from freeswitch 1
> and then answer them on freeswitch 2 and play an announcement. To analyze
> the traffic, we us tshark with the following command:
>
> tshark -q -f 'udp' -o rtp.heuristic_rtp:TRUE -z rtp,strems -w test-pcap
>
> The result is, that we see packet loss around 20% on outgoing RTP streams,
> when we have more then 20 calls. The load average shown with the top
> command is always < 0.3 with a 4 core CPU and CPU load is less then 10%.
>
> ========================= RTP Streams ========================
>     Src IP addr  Port    Dest IP addr  Port       SSRC          Payload
> Pkts         Lost   Max Delta(ms)  Max Jitter(ms) Mean Jitter(ms) Problems?
>   192.168.1.134 27590   192.168.1.135 22576 0xCD7A189D      ITU-T G.722
> 800     2 (0.2%)           59.93            0.11            0.05 X
>   192.168.1.135 22576   192.168.1.134 27590 0x5D4E50CD      ITU-T G.722
> 599   202 (25.2%)          160.24            0.16            0.05 X
>   192.168.1.134 28172   192.168.1.135 29704 0xD53EC9AD      ITU-T G.722
> 798     2 (0.2%)           59.99            0.07            0.04 X
>   192.168.1.135 29704   192.168.1.134 28172 0x5D50942D      ITU-T G.722
> 713    86 (10.8%)          199.98            0.08            0.04 X
>   192.168.1.135 25794   192.168.1.134 16460 0x5D51E43D      ITU-T G.722
> 633   165 (20.7%)          180.25            0.75            0.07 X
>
> Instead of tshark, we also tried to capture SIP & RTP with tcpdump with
> the following command:
>
> tcpdump -i any -T rtp -vvvvv -s 0 -w test.pcap
>
> If we analyze this file with wireshark (TELEPHONY->RTP->Show all Streams),
> it shows almost always 0% for packet loss. Only if we increase the load to
> 50 calls we can see a similar scenario where inbound calls still have < 1%
> packet loss but outgoing RTP streams have up to 20 % packet loss. We also
> repeated the same test with freeswitch 1.4.15 with much more powerful
> hardware with almost the same results.
>
> The question is what do we see here. Does tshark show us wrong result? Can
> we more trust on the results captured with tcpdump or is there finally an
> issue in freeswitch when sending outgoing packets? Or is the method to
> capture on the server in general the wrong approach?
>
> Thanks for any comments and hints
>
> Markus
>
>
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-- 

*Brian West*
brian at freeswitch.org


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