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? Regards, Ronald Voermans -----Oorspronkelijk bericht----- Van: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Namens Maxim Sobolev Verzonden: zondag 10 augustus 2008 1:38 Aan: RTPproxy Users Onderwerp: Re: [RTPproxy Users] About Jitter Ronald Voermans wrote: > Dear listusers, > > I've been running wireshark on the server which has installed OpenSer and > RTPProxy. After doing a trace I find the following: > > Example: > Call goes from 77.94.246.11 -> 10.254.254.1 -> 10.166.38.109 (NAT is in > place). OpenSer and RTPProxy are installed on 10.254.254.1. RTPProxy is > started via de UDP-socket. > This was the only call going on! > > Analysis shows: > 77.94.246.11 -> 10.254.254.1 : Max delta 34.24, Max Jitter 1.69, Mean Jitter > 1.05 > 10.254.254.1 -> 10.166.38.109: Max delta 41.78, Max Jitter 5.50, Mean Jitter > 3.83 > > 10.254.254.1 is a HP DL140 (Xeon Processor) with 4 GB memory. CPU is around > 0.2%. > > I've installed the latest stable RTPProxy. Even with one call I get a > reasonably extra jitter by RTPProxy. What could be the cause of this? The RTPproxy is by design introduces some extra jitter - around 5ms with default settings. However in practice this doesn't cause any quality issues, since any UA should be able to do jitter compensation for much larger jitter up to tens if not hundred ms. You can decrease additional jitter (at the expense of some extra CPU time) by increasing POLL_LIMIT constant in the rtpp_defines.h and recompiling the software. Increasing it by 5 times should decrease extra jitter down to less than 1 ms. 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
