Maksym, That seemed to do the trick. I increased the POLL_LIMIT to 500, and all the jitter I experienced is over. Looks like it still was a problem of our ITSP (who uses a Cirpack platform), because their jitterbuffer was set at 120ms, which should be more than enough for the jitter we were experiencing. But changing the POLL_LIMIT made the problems go away!!!
What could be the maximum setting for the POLL_LIMIT? Thanks!!! Regards, Ronald -----Oorspronkelijk bericht----- Van: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Namens Maxim Sobolev Verzonden: dinsdag 12 augustus 2008 21:57 Aan: RTPproxy Users Onderwerp: Re: [RTPproxy Users] About Jitter Ronald Voermans wrote: > Maksym, > > Thank you for your answer. I'll go and try it. One other question about it: > > The call is exactly as described below. With every call I see the following: > > every third or fourth RTP packet has a arrival time (Delta) of around 11 ms > instead of around 20-23 ms. > > When I capture the traffic *before* it enters RTPproxy, every RTP packet has > a normal arrival time (Delta) of around 20-23ms. > > Why does this happen? The RTPproxy processes incoming packets in "batches", with roughly 10ms interval between batches (by default). Let's say first packet arrives at 9th ms, while the second at 21st ms. As a result, the first will get to the first "batch" and will be sent out almost immediately at 10th ms with the 1ms of delay, while the second will only get to the third "batch", and therefore will go out around 30th ms with 9ms of additional delay. Interval between first and the second would be 12ms in and 20ms out. This is the mechanism that causes jitter to be slightly higher after rtpproxy processing. As I have said, you can decrease this effect by increasing the value of POLL_LIMIT. Regards, -- Maksym Sobolyev Sippy Software, Inc. Internet Telephony (VoIP) Experts T/F: +1-646-651-1110 Web: http://www.sippysoft.com _______________________________________________ Users mailing list Users@rtpproxy.org http://lists.rtpproxy.org/mailman/listinfo/users _______________________________________________ Users mailing list Users@rtpproxy.org http://lists.rtpproxy.org/mailman/listinfo/users
