[Freeswitch-users] RTP media Issue

Sun May 13 03:33:05 MSD 2012

Hi Anthony,

Thanks for the input,  I am happy to leave it on if there is no performance
penalty, it's a quad core xeon so it isn't even scratching the surface yet.
The weird thing is if I do a wireshark on the interface that goes from
endpoint - fs and one on the fs - trunk at the same time I don't see the
same issue coming in, that is what was confusing me.  Maybe the endpoint
isn't handling the timestamp issue as well as FS is, because the problem
they report is worse than what I hear in the trace.

We can consider this issue resolved unless I find out it is causing some
other issue, I haven't found jitter too much problem yet as it is all over
fibre and I have a 2-3ms end to end latency. Keep up the good work on a
brilliant product!

From: freeswitch-users-bounces at lists.freeswitch.org
[mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Anthony
Minessale
Sent: Sunday, 13 May 2012 4:31 AM
To: FreeSWITCH Users Help
Subject: Re: [Freeswitch-users] RTP media Issue

With the option off the original timestamps from the inbound leg to Fs are
passed out the outbound leg.  With it on Fs creates new timestamps, there is
no performance penalty but the disadvantage is that any jitter will he
masked since the timestamps are changed .  If the calls sound ok then its ok
to leave it.

On May 12, 2012 12:49 AM, "Mr Nathan Downes" <nathandownes at hotmail.com>
wrote:

Thanks for the response,

Keys:  Help   Display mode   Restart statistics   Order of fields   quit

                                       Packets               Pings

Host                                Loss%   Snt   Last   Avg  Best  Wrst
StDev

1. 10.77.0.254                       0.0%    18911    0.2   0.2   0.2   0.2
0.0

2. 192.168.5.1                       0.0%    18911    2.4
<tel:2.4%C2%A0%C2%A0%202.4%C2%A0%C2%A0%202.3%C2%A0%C2%A0%202.4%C2%A0%C2%A0%2
00.0>    2.4   2.3   2.4   0.0

3. 10.77.4.22                        0.0%    18911    2.7   3.1   2.4   4.1
0.5

1 is my switch at DC, 2 is unknown on fibre, 3 is endpoint ATA device at
site about 140km away

Duplex is set correctly on all interfaces, I don't see anything on the fibre
part of network it is all L2.

I am not sure if it is a network issue, as the wireshark capture I was doing
on the server that FS resides on, and it was reporting the stream going from
FS to endpoint had the wrong timestamps.

From: freeswitch-users-bounces at lists.freeswitch.org
[mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of
Robert-IPhone
Sent: Saturday, 12 May 2012 10:09 AM
To: FreeSWITCH Users Help
Cc: <freeswitch-users at lists.freeswitch.org>
Subject: Re: [Freeswitch-users] RTP media Issue

Start with running an extended "mtr" between the locations.

Maybe you are dealing with a latency issue.

I've also seen issues with duplexing.

So look at low level network issues

Sent from my iPhone 4S

On May 11, 2012, at 5:58 PM, Mr Nathan Downes <nathandownes at hotmail.com>
wrote:

Hi

First time trying this mailing list,  I have my FS server in a data centre,
which feeds site a, site b etc. over a fibre network.  We are having really
bad call quality issues at one of the sites.  The residents report that
every second or 2 there is a hiccup in the incoming voice and they miss a
portion of the voice.  It is consistent and affects everybody.  I did some
wireshark tracing of both sides of the calls (ext - fs and fs - provider)
and to me it appears packets coming from my server have a wrong timestamp
every second or so.  The server is not over loaded and is pretty default
Ubuntu 10.04 LTS, latest FS Head on there.  I spent a week trying to
diagnose with both the fibre provider and trunk provider but we couldn't
figure out the cause.  I then tried putting rtp-rewrite-timestamps in both
the profiles (external one to provider, and internal one specifically for
fibre company) and the problem appears to have gone away.  I would like to
figure out what is/was causing the issue and also find out if that option
puts any extra overhead on the server. If there is almost no overhead I
would probably leave it on and just assume I need I for this specific
connection.  I don't have the issue at another site over same fibre network
and trunk provider, and people connecting direct over internet don't suffer
same problem.  I have about 2gb of wireshark traces I can put online if
required.

Thanks, Nathan

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_________________________________________________________________________
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consulting at freeswitch.org
http://www.freeswitchsolutions.com

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http://wiki.freeswitch.org
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