G729 codecs

Unanswered Question
Jan 24th, 2008

Setting up a G729 H323 site I notice under voice class codec or the voip dial-peer config I can only select:

G729r8 or g729br8

Under the conference or transcoder profiles I can select all variations of g729:

g729abr8 G.729ab 8000 bps

g729ar8 G.729a 8000 bps

g729br8 G.729b 8000 bps

g729r8 G.729 8000 bps

Does this mean I can only use g729 or g729ab across the WAN?

Steve

I have this problem too.
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Paolo Bevilacqua Fri, 01/25/2008 - 14:32

No.

Having Annex "a" support, gives a lighter computational algorithm of "a". The GW do select that automatically, depending on the platform and the "dsp complexity" chosen, where applicable. Basically, you don't need to worry about it.

Annex "B", is a sophisticated VAD scheme embedded in the codec, that cannot be disabled. don't select g729br8 unless you really need to save bandwidth (not much people like VAD anyway).

Annex A & B can also coexist.

Hope this helps, please rate post if it does!

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