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 From:  Melvin <melvin at sleepydragon dot net>
 To:  sai <sonicsai at gmail dot com>
 Cc:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] voip traffic shaping
 Date:  Tue, 15 Nov 2005 05:57:58 -0500
sai wrote:

>with more than 15 voip phones working at the same time I get some echo
>and buzzing sounds when shaping is turned on. Any ideas as to why echo
>happens in voip networks?
>I have 1 queue setup for all voip traffic and this has priority 90.
>All other trafic is in another queue with priority 10.
>Would increasing memory (I have 128MB) help? Any other suggestions?
Normally echo is one of the symptoms of too little bandwidth.  Assuming 
you don't have it without shaping turned on, I'd guess that you'll also 
see it even without shaping if you increase the number of active 
phones.  What kind of connection are you on?  You may be nearing 
saturation of you're outbound connection.  The 10% you're removing to 
deal with shaping could be pushing you over the limit.