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

[Daniel Greenwald]

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-
> bounces 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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