Ivan Meic (Vox Mundi) wrote:
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.
Steve,
Any Cisco gateway support two G.729 variants.
They call them g729r8 and g729br8.
So I guess that Cisco never implemented a reduced complexity version ?
Also as far as I understand there are 3 G.729 variants generaly used.
The first version (G.729), Annex A and Annex B.
Are they all compatible with each others ?
Ivan
Actually, I believe Cisco uses G.729A, as they use TI chips.
The difference between G.729 and G.729A is Annex A spends less time
looking for the optimal representation of the voice. G.729 and G.729A
are completely compatible. Annex B adds silence suppression. I believe
you need to support and negotiate annex B on both ends if you want to
use it. I'm against silence suppression but that's just me. Annex C is
the floating point version and obviously completely compatiable as well
-Adam
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