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Re: [Linphone-developers] Voice quality on 3G and EDGE

From: Simon Morlat
Subject: Re: [Linphone-developers] Voice quality on 3G and EDGE
Date: Thu, 09 Sep 2010 21:09:14 +0200

Le mercredi 08 septembre 2010 à 08:43 -0600, Matt Gilg a écrit :
> Has anyone tested the auto-elimination of duplicates?  
> I've recently done a test that wraps and forwards RTP packets (vpn
> style) as well as sent direct, and I found that the duplicate
> detection wasn't working.  Care was taken to be sure that identical
> packets with the same timestamp showed up on the same session on the
> receiving end. 
"same timestamp": yes there is no reason to discard packets that have
same timestamp. This is very common with video packets to have identical
timestamps for packets belonging to the same frame.
Only sequence number matters to know whether a packet is a duplicate.

Obviously if oRTP doesn't drop packets with similar sequence number that
is a bug.


>  The audio sounded, well, like the stack was processing duplicate
> packets.  Audio sounded a bit like a CD skipping.
> Anyhow, for what it is worth, oRTP used together with Mediastreamer2
> didn't seem to drop duplicates like I expected.
> --Matt
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