Hi, so you had on the wire about 15.8 secs of bidirectional g711 PCMU data, undoubtedly more than what you got from your fd. Maybe the fd is not connected to the proper socket (should be port 35364 or 7078, dunno what's the device you're running the pipeline onto). Another guess: check whether you're setting the caps between udpsrc and depayloader to something like: "application/x-rtp,media=audio,clock-rate=8000,encoding-name=PCMU,payload=0" Regards <div class="gmail_quote">On Fri, Nov 5, 2010 at 6:43 PM, Michael Trimarchi <<a href="mailto:michael@panicking.kicks-ass.org">michael@panicking.kicks-ass.org</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> On 11/05/2010 05:21 PM, Marco Ballesio wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> tcpdump -s0 -i </blockquote> </blockquote></div>