From: paul.bosio@didata.com.au
Date: Tue Feb 04 2003 - 19:36:44 GMT-3
Lillemor,
2 options,
1/
You can alter the codec bytes value to 40 so each call only takes 16K.
The maths are as follows:
Normal call is 60 bytes (40 bytes header + 20 bytes audio payload) per
packet with 50pps
If we use 40 bytes audio payload = 40bytes header + 40 bytes audio = 80
bytes = 640 bits
Double the payload half the amount of packets per seconds.
640 bits by 25 packets per second = 16000 bits per second per call
You configure like this :
dial-peer voice 1 voip
destination-pattern 1234
session target ipv4:<IP address>
codec g729r8 bytes 40
2/
ip rtp header-compression on the serial interface should drop this down to
11-13Kbps per call.
This reduces the IP header to around 2-3 bytes per packet.
Cheers
"Lillemor
Hamnqvist" To: <ccielab@groupstudy.com>
<lillemor@hamnqvi cc:
st.org> Subject: OT: Voice compression
Sent by:
nobody@groupstudy
.com
05/02/2003 07:04
AM
Please respond to
"Lillemor
Hamnqvist"
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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