[Freeswitch-users] RTP Timing

David Ponzone david.ponzone at gmail.com
Wed Jul 21 08:54:03 PDT 2010


Steven,

sure, and in the default config, rtp-rewrite-timestamps is commented  
out and false by default.

David Ponzone  Direction Technique
email: david.ponzone at ipeva.fr
tel:      01 74 03 18 97
gsm:   06 66 98 76 34

Service Client IPeva
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Le 21/07/2010 à 17:44, Steven Ayre a écrit :

> That's not quite true - if it depends on the value in the sip  
> profile of:
> <param name="rtp-rewrite-timestamps" value="true"/>
>
> Sonus is known to have timestamp problems. Is there a Sonus gateway  
> anywhere in the media path?
>
> -Steve
>
>
> On 21 July 2010 15:51, David Ponzone <david.ponzone at gmail.com> wrote:
> Neil,
>
> as far as I know, by default, FS is transparent for timestamps.
> It writes in outbound RTP the exact timestamp that it received in  
> inbound RTP.
> So you should perhaps have a look at the sending endpoint ?
>
> David Ponzone  Direction Technique
> email: david.ponzone at ipeva.fr
> tel:      01 74 03 18 97
> gsm:   06 66 98 76 34
>
> Service Client IPeva
> tel:      0811 46 26 26
> www.ipeva.fr  -   www.ipeva-studio.com
>
> Ce message et toutes les pièces jointes sont confidentiels et  
> établis à l'intention exclusive de ses destinataires. Toute  
> utilisation ou diffusion non autorisée est interdite. Tout message  
> électronique est susceptible d'altération. IPeva décline toute  
> responsabilité au titre de ce message s'il a été altéré, déformé ou  
> falsifié. Si vous n'êtes pas destinataire de ce message, merci de le  
> détruire immédiatement et d'avertir l'expéditeur.
>
>
>
>
> Le 21/07/2010 à 16:36, Neil Burgess a écrit :
>
>> Hi,
>>
>> We are capturing packets for call quality monitoring purposes, and  
>> as part of the capture, we are grabbing the outbound packets from  
>> FreeSwitch. We are noticing what appears to be an odd behaviour in  
>> the RTP sequence timing where suddenly the timing will jump from  
>> the regular 160 increments to a number in the 10’s of millions! See  
>> packet 38 below. Now I have no idea as to whether such a timing  
>> change is OK in RTP, and although the actual RTP stream does not  
>> appear to be affected, I do see that Wireshark believes there is a  
>> massive amount of jitter on the line when it analyses the packets,  
>> and any RTCP Sender Reports from the target device (and indeed  
>> several different target types have been tried) also report very  
>> large inter arrival jitter numbers at this point! It’s the RTCP  
>> side of things that are more of interest here, as trying to get  
>> accurate results of our downstream jitter by capturing the returned  
>> RTCP packets. I believe that all the times we see this, there is  
>> however a Marker bit present!
>>
>> So I guess the question is whether this is expected behaviour, and  
>> if not any ideas?
>>
>> No.     Time        Source                Destination            
>> Protocol Info
>>       1 0.000000    gmtpbx02.redmatter.com sil1.magrathea.net     
>> SIP/SDP  Request: INVITEsip:441277849884 at sipipgw.magrathea.net,  
>> with session description
>>       2 0.001595    sil1.magrathea.net    gmtpbx02.redmatter.com  
>> SIP      Status: 100 Giving a try
>>       3 1.103160    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=0, Time=0
>>       4 1.124816    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=1, Time=160
>>       5 1.142758    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=2, Time=320
>>       6 1.163702    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=3, Time=480
>>       7 1.184239    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=4, Time=640
>>       8 1.203259    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=5, Time=800
>>       9 1.223456    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=6, Time=960
>>      10 1.243953    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=7, Time=1120
>>      11 1.264504    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=8, Time=1280
>>      12 1.284839    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=9, Time=1440
>>      13 1.304590    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=10, Time=1600
>>      14 1.323589    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=11, Time=1760
>>      15 1.344672    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=12, Time=1920
>>      16 1.359227    sil1.magrathea.net    gmtpbx02.redmatter.com  
>> SIP/SDP  Status: 183 Session Progress, with session description
>>      17 1.364522    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=13, Time=2080
>>      18 1.377484    gmtpbx02.redmatter.com lon-avon- 
>> four.magrathea.net RTP      PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,  
>> Seq=53974, Time=160, Mark
>>      19 1.383466    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=14, Time=2240
>>      20 1.397476    gmtpbx02.redmatter.com lon-avon- 
>> four.magrathea.net RTP      PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,  
>> Seq=53975, Time=320
>>      21 1.403953    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=15, Time=2400
>>      22 1.417484    gmtpbx02.redmatter.com lon-avon- 
>> four.magrathea.net RTP      PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,  
>> Seq=53976, Time=480
>>      23 1.423616    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=16, Time=2560
>>      24 1.437474    gmtpbx02.redmatter.com lon-avon- 
>> four.magrathea.net RTP      PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,  
>> Seq=53977, Time=640
>>      25 1.444930    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=17, Time=2720
>>      26 1.457475    gmtpbx02.redmatter.com lon-avon- 
>> four.magrathea.net RTP      PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,  
>> Seq=53978, Time=800
>>      27 1.463341    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=18, Time=2880
>>      28 1.477473    gmtpbx02.redmatter.com lon-avon- 
>> four.magrathea.net RTP      PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,  
>> Seq=53979, Time=960
>>      29 1.484235    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=19, Time=3040
>>      30 1.497483    gmtpbx02.redmatter.com lon-avon- 
>> four.magrathea.net RTP      PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,  
>> Seq=53980, Time=1120
>>      31 1.503415    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=20, Time=3200
>>      32 1.517474    gmtpbx02.redmatter.com lon-avon- 
>> four.magrathea.net RTP      PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,  
>> Seq=53981, Time=1280
>>      33 1.523541    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=21, Time=3360
>>      34 1.537472    gmtpbx02.redmatter.com lon-avon- 
>> four.magrathea.net RTP      PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,  
>> Seq=53982, Time=1440
>>      35 1.543428    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=22, Time=3520
>>      36 1.557567    gmtpbx02.redmatter.com lon-avon- 
>> four.magrathea.net RTP      PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,  
>> Seq=53983, Time=1600
>>      37 1.563656    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=23, Time=3680
>>      38 1.577496    gmtpbx02.redmatter.com lon-avon- 
>> four.magrathea.net RTP      PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,  
>> Seq=53984, Time=130238272, Mark
>>      39 1.584747    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=24, Time=3840
>>      40 1.597474    gmtpbx02.redmatter.com lon-avon- 
>> four.magrathea.net RTP      PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,  
>> Seq=53985, Time=130238432
>>      41 1.603871    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=25, Time=4000
>>      42 1.617465    gmtpbx02.redmatter.com lon-avon- 
>> four.magrathea.net RTP      PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,  
>> Seq=53986, Time=130238432
>>      43 1.624224    lon-avon-four.magrathea.net  
>> gmtpbx02.redmatter.com RTP      PT=ITU-T G.711 PCMU,  
>> SSRC=0x216DE2D9, Seq=26, Time=4160
>>      44 1.637466    gmtpbx02.redmatter.com lon-avon- 
>> four.magrathea.net RTP      PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,  
>> Seq=53987, Time=130238592
>>
>> Many thanks,
>> Neil
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