[Freeswitch-users] RTP packet loss on outgoing streams

Fri Apr 17 23:10:26 MSD 2015

What kind of network cards does this system have?

On Fri, Apr 17, 2015 at 2:06 PM, mbo <mbodbg at gmx.net> wrote:

> On the system itself.
>
>
>
> Am 17.04.2015 um 17:47 schrieb Brian West <brian at freeswitch.org>:
>
> 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
>>
>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>>
>> Official FreeSWITCH Sites
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>> http://confluence.freeswitch.org
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>>
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>>
>
>
>
> --
>
> *Brian West*
> brian at freeswitch.org
>
>
> *Twitter: @FreeSWITCH , @briankwest*
> http://www.freeswitchbook.com
> http://www.freeswitchcookbook.com
>
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>  _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://confluence.freeswitch.org
> http://www.cluecon.com
>
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> http://www.freeswitch.org
>
>
> mbo
> mbodbg at gmx.net
>
>
>
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://confluence.freeswitch.org
> http://www.cluecon.com
>
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> http://www.freeswitch.org
>

-- 

*Brian West*
brian at freeswitch.org

*Twitter: @FreeSWITCH , @briankwest*
http://www.freeswitchbook.com
http://www.freeswitchcookbook.com

ClueCon 2015 Call for Speakers <https://www.cluecon.com/call-for-speakers/> |
Register <https://freeswitch.com/cart.php?gid=1> TODAY! | Reddit:
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*T:*+19184209001 | *F:*+19184209002 | *M:*+1918424WEST (9378)
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