[Freeswitch-users] RTP media Issue

[Mr Nathan Downes]

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   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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