[Linphone-developers] RTCP Sender Report bug

[Nicholas J Humfrey]

Hello,

I have been using RAT (Robust Audio Tool) and my mast_filecast took  
(which uses oRTP) together and I have been wondering why it keeps  
displaying a source called 00000000.

http://users.ecs.soton.ac.uk/njh/tmp/rat-00000000.png

From doing a bit of packet dumping I discovered that oRTP is sending  
out SR (sender report) packets that report on the SSRC 0x0. The  
receiver report should be the SSRC of the sender itself instead.

nick.



1187354758.777047 RTCP len=116 from=212.219.210.62:10867
 (SR ssrc=0xdeb5668a p=0 count=1 len=12
  ntp=3396348729.3712754414 ts=3788811598 psent=11840808  
osent=2412435480
  (ssrc=0x0 fraction=0 lost=0 last_seq=0 jit=0 lsr=0 dlsr=0 )
 )
 (SDES p=0 count=1 len=15
  (src=0xdeb5668a CNAME="address@hidden" TOOL="oRTP" )
 )


1187357621.776144 RTCP len=104 from=152.78.64.80:5005
 (SR ssrc=0x4c7e0a17 p=0 count=1 len=12
  ntp=3396346421.3332298750 ts=1073986028 psent=2527 osent=1647604
  (ssrc=0x4c7e0a17 fraction=0.00390625 lost=0 last_seq=0 jit=254  
lsr=573653602 dlsr=295977 )
 )
 (SDES p=0 count=1 len=12
  (src=0x4c7e0a17 CNAME="address@hidden" TOOL="rat" )
 )