asterisk users - Apr 2005 - Is There Media Accelerator For Better AsteriskCalls

The bandwidth numbers you are talking about, I would presume they are
Kilo Bytes and not Kbps. Please note that the Interent bandwidth is
always referred in kbps (Kilo Bits Per Second) and not as Bytes, which
is referred for data file sizes and disk space consumed. 

Ulaw at 9.3 Kbs oscillating around 5kbs to 9.3 kbs, 
and gsm with speed of 3.1 kbs to 1 kbs

Multiplying that with 8 you get numbers like 72Kbps and 24Kbps, which
close to what these two codecs can performa optimally.

If you want to save on the bandwidth cost, the only way you can do that
is by adopting a low bandwidth codec like G729 or G723, which consumes
much less bandwidth and can give equal or better quality calls. 

Seshu 

-----Original Message-----
From: asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of chawki
hammoud
Sent: Tuesday, April 26, 2005 1:31 PM
To: Asterisk-Users@lists.digium.com
Subject: [Asterisk-Users] Is There Media Accelerator For Better
AsteriskCalls

Dear Asterisk Users:

Please give me your opinion or advise of how I can optimize my internet
bandwidth to get better calls.

During morning hours, calls are fine. But during high traffic time, I
have calls problems. So I experimented with changing the codecs in iax
file and monitoring the internet bandwidth using Mandrake linux control
Ctr.
When I used ulaw, the sending speed rate was at 9.3 Kbs and people can
hear me fine. The receiving speed rate was oscillating around 5kbs and
9.3 kbs where at
9.3 kbs the quality of the call is good. If I changed the codec to a
less bandwidth codec like gsm, the sending speed is 3.1 kbs and people
can hear me fine and the receiving call alternates around 1 kbs and 3.1
kbs where at 3.1 kbs i can hear people fine. In both codecs I
experienced breaking up sounds when the rate goes beyond 9.3 and 3.1.

The bandwidth for gsm is there, as it showed in ulaw.
Why gsm can't use the bandwidth consistently. Can I download something
like a media accelerator? Please tell me what you think. Any
suggestions.

Thanks; 
--------------------------------------------------------
 
NOTICE: If received in error, please destroy and notify sender.  Sender does not
waive confidentiality or privilege, and use is prohibited.

--- "Kanuri, Seshu (Company IT)"
<Seshu.Kanuri@morganstanley.com> wrote:
> If you want to save on the bandwidth cost, the only
> way you can do that
> is by adopting a low bandwidth codec like G729 or
> G723, which consumes
> much less bandwidth and can give equal or better
> quality calls. 
I pretty much tried many codecs including G729 which
has a bandwidth consumtion close to gsm, 30kbs. I had
the same results. 
I am experiencing problems during the same time of
each day 4 pm-12:00 am, the time of high traffic. This
might be causing, as Mr. Riddel suggested, a packet
loss. I will look into Mr. Riddle's suggestion and see
what I can come up with


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com