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Using G729 Codec


pbxuser911
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I changed my Codec preferences to G7.29A then G.711U

Will using G.729a Codec use more CPU performance?

 

I used to have G.711U first then G.711A then G.729A, and now that i changed it looks like the Media CPU usage is being raised a little by watching the graphic on the Status page of the PBXnSIP

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I changed my Codec preferences to G7.29A then G.711U

Will using G.729a Codec use more CPU performance?

 

I used to have G.711U first then G.711A then G.729A, and now that i changed it looks like the Media CPU usage is being raised a little by watching the graphic on the Status page of the PBXnSIP

 

That is a simple question, but the answer is complex.

 

The PBX tries to avoid translating from one codec to another ("transcoding"). However, there are situations where this becomes neccessary, for example, when both sides have no common codec, when music on hold needs to be played, when the mailbox needs to render prompts, when the agent group mixes the annoucements with the music. For regular calls, most of the time the PBX can avoid transcoding, however when the user presses the hold button the coder needs to be activated.

 

So you need to see this from a statistical point of view. Hopefully not all of your users press the hold button at the same time! Otherwise, you need to statically define how many calls your system will accept.

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