[Freeswitch-users] RTP Timing
Steven Ayre
steveayre at gmail.com
Wed Jul 21 08:44:41 PDT 2010
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
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> 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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