[Freeswitch-users] FW: FS injecting packets - what are they and how do I stop them?

[Anthony Minessale]

Your best bet is to find a way to reproduce with a pcap replay of the
inbound leg and file a JIRA.
The mailing list is not really designed to report issues.


On Tue, Nov 21, 2017 at 11:37 AM, Daniel Greenwald <dig1234 at gmail.com>
wrote:

> Do the timestamps "match" the reverse stream? I noticed something similar
> where it seemed to be confusing the streams somehow. No idea what it is
> though. In my case it was only one packet I believe.
>
> On Mon, Nov 13, 2017 at 7:14 AM, Nathan Downes <nathandownes at hotmail.com>
> wrote:
>
>> Nobody got a clue? Surely someone has seen this!
>>
>>
>>
>>
>>
>> *From:* FreeSWITCH-users [mailto:freeswitch-users-bounc
>> es at lists.freeswitch.org] *On Behalf Of *Nathan Downes
>> *Sent:* Wednesday, 8 November 2017 7:12 PM
>> *To:* freeswitch-users at lists.freeswitch.org
>> *Subject:* [Freeswitch-users] FS injecting packets - what are they and
>> how do I stop them?
>>
>>
>>
>> Hi guys,
>>
>>
>>
>> So I have an onsite FS at a clients, and we send calls to it from another
>> FS.
>>
>>
>>
>> Provider -> FS1 -> FS2 -> phone
>>
>>
>>
>> Occasionaly there is a small amount of jitter on these certain trunks,
>> FS1 passes it through normally, FS2 appears to add its own packets in to
>> the stream to fill the gaps which have the incorrect timestamp that jumps
>> around, this plays havoc with certain phones (T4 series Yealinks, T2
>> series, Polycom)
>>
>>
>>
>> Stream from FS1 to FS2 looks like below
>>
>>
>>
>> Can see a few missed packets around the Mark bit
>>
>>
>>
>> FS2 then send this to the phone
>>
>>
>>
>>
>>
>>
>>
>> It is filling in the missing packets with wrong timestamps and a payload
>> containing just 55555555555555555555555555555555555555555555’s
>>
>>
>>
>> Certain Yealink phones freak out with the timestamp jumping around
>> (confirmed by Yealink support) but this has little effect on a Cisco or T5
>> series Yealinks.  We would get a 2 second gap of audio from the above when
>> it is only 200ms or so.
>>
>>
>>
>> What exactly are these packets? And how can I stop FS2 generating them?
>> From memory FS2 is latest Debian stable packages. I have tried every
>> combination of all variables that I feel may have an effect on this but am
>> getting nowhere fast (CNG/VAD/RTP bugs etc)
>>
>>
>>
>> We tried rewriting timestamps and that solves the gaps in audio, but then
>> the jitter is much more noticeable as the jitter buffer on phone can’t tell
>> anything is going on because the timestamps are perfect.
>>
>>
>>
>> FS1 is much older 1.4.23 and doesn’t exhibit the same behaviour when
>> phone is direct connected to it.
>>
>>
>>
>> Thanks,
>>
>>
>>
>> Nathan
>>
>> _________________________________________________________________________
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>>
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>
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> Official FreeSWITCH Sites
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> http://confluence.freeswitch.org
> http://www.cluecon.com
>
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-- 
Anthony Minessale II       ♬ @anthmfs  ♬ @FreeSWITCH  ♬

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