Unanswered Question
Aug 28th, 2008

Actually i'm wondering why the differences in calculating bandwidth required for G711 & G729 in CCM & GK

CCM calculates :

G711 ---- 128 kbps

G729 ---- 24 kbps

While in GK :

G711 --- 64 kbps

G729 --- 16 kbps

I have this problem too.
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Jaime Valencia Thu, 08/28/2008 - 13:22

well, let's start with the right information because what you posted is wrong


G711 80 kbps

G729 24 kbps


g711 128 kbps

G729 16 kbps

CCM takes RTP + L2 overhead

GK only RTP BW required for 2 way communication with no overhead of any layer

you can play around with the BW calculator to get a better grip of this



if this helps, please rate

youssef.ahmed Thu, 08/28/2008 - 23:38

I'm sorry for that,i send this post when i was very tired.

Is that right behaviour from GK to calculate G711 call as 128 while it takes only 64 per call?Why GK do that?

Could you explain?

Jaime Valencia Fri, 08/29/2008 - 03:00

yes. it's the right behavior and a call does take 128 kbps, 64 EACH way unless you want 1 way audio

there is no explanation for this other than different groups developed each product and they decided it like that separately



if this helps, please rate


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