Hi I am developing a program that deals with rtpstreams. I have a procedure that need to accept rtp stream and  after decoding it forward it  to another  host: I implement a receiving part of  incomming G711 Alaw rtp stream by building a pipeline simmilar to: ---------------------------------- rtpbin  rtcp-support=false localport=ZZ ! application/x-rtp,clock-rate=8000,media=audio,payload=8,encoding-name=PCMA ! rtppcmadepay ! alawdec -------------------------------------- And I have a piece of code (that I do not want to change now !!!) that implements the following pipeline ------------------------------- alawenc ! rtppcmapay max-ptime=20000000 ! application/x-rtp,clock-rate=8000,media=audio,payload=8,encoding-name=PCMA ! rtpbin destinations=X.X.X.X:Y localport=XX --------------------------------- In order to forward the stream I link this two pipelines together, so I get the following big pipeline that I am trying to test from the command line. gst-launch-0.10  rtpbin  rtcp-support=false localport=12345 ! application/x-rtp,clock-rate=8000,media=audio,payload=8,encoding-name=PCMA ! rtppcmadepay ! alawdec ! alawenc ! rtppcmapay max-ptime=20000000 ! application/x-rtp,clock-rate=8000,media=audio,payload=8,encoding-name=PCMA ! rtpbin destinations=<a href="http://127.0.0.1:12358" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">127.0.0.1:12358</a> localport=12348 The problem is that if I am starting rtpstream before I launch the above command all outgoing packets have constant timestamp! But if I start the command above before I start rtpstream, outgoing stream from my host looks fine. So I guess that I have a sync problem that I do not know how to solve. Please help me to solve it ! Thanks Rony,