[Freeswitch-users] RTP Timing
Steven Ayre
steveayre at gmail.com
Wed Jul 21 09:52:35 PDT 2010
I know, but it's worth checking in case he isn't on the default config. ;)
On 21 July 2010 16:54, David Ponzone <david.ponzone at gmail.com> wrote:
> 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
>
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>
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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.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=0, Time=0
>> 4 1.124816 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=1, Time=160
>> 5 1.142758 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=2, Time=320
>> 6 1.163702 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=3, Time=480
>> 7 1.184239 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=4, Time=640
>> 8 1.203259 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=5, Time=800
>> 9 1.223456 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=6, Time=960
>> 10 1.243953 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=7, Time=1120
>> 11 1.264504 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=8, Time=1280
>> 12 1.284839 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=9, Time=1440
>> 13 1.304590 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=10, Time=1600
>> 14 1.323589 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=11, Time=1760
>> 15 1.344672 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP 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.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=13, Time=2080
>> 18 1.377484 gmtpbx02.redmatter.com lon-avon-four.magrathea.netRTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7, Seq=53974, Time=160, Mark
>> 19 1.383466 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=14, Time=2240
>> 20 1.397476 gmtpbx02.redmatter.com lon-avon-four.magrathea.netRTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7, Seq=53975, Time=320
>> 21 1.403953 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=15, Time=2400
>> 22 1.417484 gmtpbx02.redmatter.com lon-avon-four.magrathea.netRTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7, Seq=53976, Time=480
>> 23 1.423616 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=16, Time=2560
>> 24 1.437474 gmtpbx02.redmatter.com lon-avon-four.magrathea.netRTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7, Seq=53977, Time=640
>> 25 1.444930 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=17, Time=2720
>> 26 1.457475 gmtpbx02.redmatter.com lon-avon-four.magrathea.netRTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7, Seq=53978, Time=800
>> 27 1.463341 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=18, Time=2880
>> 28 1.477473 gmtpbx02.redmatter.com lon-avon-four.magrathea.netRTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7, Seq=53979, Time=960
>> 29 1.484235 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=19, Time=3040
>> 30 1.497483 gmtpbx02.redmatter.com lon-avon-four.magrathea.netRTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7, Seq=53980, Time=1120
>> 31 1.503415 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=20, Time=3200
>> 32 1.517474 gmtpbx02.redmatter.com lon-avon-four.magrathea.netRTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7, Seq=53981, Time=1280
>> 33 1.523541 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=21, Time=3360
>> 34 1.537472 gmtpbx02.redmatter.com lon-avon-four.magrathea.netRTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7, Seq=53982, Time=1440
>> 35 1.543428 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=22, Time=3520
>> 36 1.557567 gmtpbx02.redmatter.com lon-avon-four.magrathea.netRTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7, Seq=53983, Time=1600
>> 37 1.563656 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=23, Time=3680
>> 38 1.577496 gmtpbx02.redmatter.com lon-avon-four.magrathea.netRTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7, Seq=53984, Time=130238272,
>> Mark
>> 39 1.584747 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=24, Time=3840
>> 40 1.597474 gmtpbx02.redmatter.com lon-avon-four.magrathea.netRTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7, Seq=53985, Time=130238432
>> 41 1.603871 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=25, Time=4000
>> 42 1.617465 gmtpbx02.redmatter.com lon-avon-four.magrathea.netRTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7, Seq=53986, Time=130238432
>> 43 1.624224 lon-avon-four.magrathea.net gmtpbx02.redmatter.comRTP PT=ITU-T G.711 PCMU, SSRC=0x216DE2D9, Seq=26, Time=4160
>> 44 1.637466 gmtpbx02.redmatter.com lon-avon-four.magrathea.netRTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7, Seq=53987, Time=130238592
>>
>> Many thanks,
>> Neil
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