Steve
Thank you for the enlightenment, that explains allot and it even makes
sense.
So I take it that means that there is no other version as far as Asterisk
is concerned; it only is designed to use G.729A, correct?
Do you know if the data rate, kbps, is a constant or does it fluctuate?
For example I have heard with a Avaya design if no one was speaking it could
get down to practically nothing while holding a line open. Does Asterisk
have the ability to use less then 8 kbps with the G.729?
TKG
----- Original Message -----
From: "Steve Underwood" <[EMAIL PROTECTED]>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<asterisk-users@lists.digium.com>
Sent: Tuesday, May 24, 2005 5:20 PM
Subject: Re: [Asterisk-Users] G729 codec
Actually G.729A is a reduced complexity version, and G.729B is a version
with silence suppression. The data rate while sending voice is exactly the
same, although the quality of G.729B should be a little higher. However
the average rate for B can be lower if the silence suppression is used.
Right now Asterisk doesn't make use of that silence suppression, so it
makes not difference.
Regards,
Steve
Zoa wrote:
Thats incorrect,
a and b are both the same, 8kbps.
a and b are just another way of calculating it, the result is the same
and a and b are compatible.
todd wrote:
----- Original Message ----- From: "todd" <[EMAIL PROTECTED]>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<asterisk-users@lists.digium.com>
Sent: Tuesday, May 24, 2005 12:34 PM
Subject: Re: [Asterisk-Users] G729 codec
Andrew
Thanks for the reply-
Forgive my ignorance in this area but from what I have been told by
the client was that G.729 b used less over all bandwidth on average )
then G.729 A.
Correct me if I am wrong but the way it was laid out to me was G.729
B = (5.? kbps-8 kbps) G.729 A= (8 kbps -13kbps) , these of course
stats form Avaya devices, maybe for whatever reason Asterisk capable
of keeping it at 8?
This is way out of my area, I would love to be wrong and be able to
use A if it can perform they way they want.
The reason it is an issue they serve international circuits and every
bit counts and adds up with the volume they do.
TKG
----- Original Message ----- From: "Andrew Kohlsmith"
<[EMAIL PROTECTED]>
To: <asterisk-users@lists.digium.com>
Sent: Tuesday, May 24, 2005 6:55 AM
Subject: Re: [Asterisk-Users] G729 codec
On May 22, 2005 04:46 pm, todd wrote:
Thanks for the info: do you know if the g729 codec for Asterisk is
limited
to only the G.729A version. Is there G.729 B available for Asterisk?
Does it matter?
g729 has fixed-point and floating-point implementations. The data
coming out
the back end is the same. Either a is floating-point and b is
fixed-point or
the other way 'round (I can never remember).
It should not make one whit of difference which one you use to
generate the
g729 stream. Do you have a specific reason to need one over the
other?
-A.
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