[Asterisk-Users] Most common CODEC

[Steve Underwood]

Michael Shuler wrote:

>G.729 is just about everywhere.  A lot of boxes use G.723 (and/or G.726) too
>but G.729 ends up with about the same quality but at a much lower bit rate.
>  
>
That's wrong. G.723 has the lowest bit rate amongst those codecs.

>Most inexpensive "hard" phones don't use G.723 because it takes a lot of CPU
>power.  G.729 gets better results in the same or less CPU.  We always try to
>  
>
That's not the reason. It costs money, takes some a DSP's usually 
limited memory space, and doesn't serve much purpose. The CPU 
requirements for G,723 are not much different from G.729. G.723 is 
basically obsolete. G.729 has passed it by.

>use phones supporting G.729, anything else is just gravy.  If you can use
>  
>
That is certainly true. G.729 isn't very nice in many ways, but it is 
the common ground codec you find across most VoIP kit.

>reinvites then you have no need for the G.729 unless you use the IVR, MOH,
>etc. features of * where it is dishing out audio.  Even then you have to
>consider if its worth it... After all if you are starting hosted VM company
>using * then the G.729 is a must, but if you are just using to route calls
>between 2 phones that can reinvite then the codec capabilities of * don't
>matter.
>  
>
Regards,
Steve