30 Jun
2006
30 Jun
'06
3:37 p.m.
Don't forget things like jitter buffers, ECAN and tx/rx gains. All of
these can be used to fine tune quality on calls, especially if the calls
are terminating to a PSTN gateway. For instance on the Cisco 79XX IP
phones dropping the microphone tx gain a couple of decibels (sometimes
as much as -10db) can get rid of a lot of echo and on Sipura ATA's it
makes other things such as G711 uLaw fax pass through more reliable.
-Evan
Edson wrote:
1) QoS (shapping, priority, etc);
2) Codecs (LPC10 (arghhh)? G723.1? ILBC? G729? Speex? GSM? G726?);
3) Bandwidth (num_call * real_codec_bnad_required * 1,2_for_safity +
num_video * real_video_band * 1,1_for_safity + ..);
In this order.... ;)
Edson
_____
From: serusers-bounces(a)lists.iptel.org
[mailto:serusers-bounces@lists.iptel.org] On Behalf Of Mike Cassidy
Sent: quinta-feira, 29 de junho de 2006 15:34
To: serusers(a)lists.iptel.org
Subject: [Serusers] Call quality
Can anyone point me in the right direction for resources that could help me
to improve call quality? I have everything up and running ok, but the
quality of the calls is a bit ropey at the moment. Any help here would be
much appreciated.
Thanks in advance,
Mike
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