[Freeswitch-users] How to configure g729 pass though on Freeswitch

Steve Underwood steveu at coppice.org
Mon Apr 5 18:16:23 PDT 2010

Hi Frank,

On 04/06/2010 01:00 AM, Frank Church wrote:
> I changed the 'G729a Codec Name' in the Linksys to G729 and the calls
> were completely garbled, even the ringing. It could be affecting
> something on the provider end.
> Could it be that the provider has a different G729 codec that is not
> compatible with the actual G729a the Linksys is sending?
G.729 and G.729A are identical on the wire, which is why there is only a 
single SDP code for them. The only time you would ever see an 
incompatible G.729 is if you are working with an ancient Cisco. They had 
a form of G.729 at one time that packed all the bits in the opposite 
order. Its rare to see that these days, though. Its more likely 
something strange happens with the ptime.


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