From: Joe Chang (changjoe@earthlink.net)
Date: Tue Feb 04 2003 - 19:01:42 GMT-3
You can compress the UDP/RTP header that VoIP rides on.
RTP header compression:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/qos_c
/qcpart6/qcrtphc.htm
A configuration example of C-RTP:
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/1700/1750/175
0voip/exampl.htm#xtocid1
The average bandwidth taken up by a call will depend on the codec:
http://www.cisco.com/warp/public/788/voip/codec_complexity.html#mos
In that same link there's a chart you can find the codec that's used on your
platform.
----- Original Message -----
From: "Lillemor Hamnqvist" <lillemor@hamnqvist.org>
To: <ccielab@groupstudy.com>
Sent: Tuesday, February 04, 2003 4:04 PM
Subject: OT: Voice compression
> Hi,
>
> I have a dedicated VoIP circuit, HDLC. What can I do to get the better
> compression? I'm using g729, but it looks like each call takes about
30kb.(I
> look at the load in the serial line). I would expect it to be lower. Is
the
> load number in 'show interface serial' accurate ? What is your experience
?
> Thank you,
> /lillemor
> .
.
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