[Asterisk-Users] G729 codec

[Steve Underwood]

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" <tkgun-zaurus at comcast.net>
>> To: "Asterisk Users Mailing List - Non-Commercial Discussion"
>> <asterisk-users at 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"
>>> <akohlsmith-asterisk at benshaw.com>
>>> To: <asterisk-users at 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.
>>>