[asterisk-users] meetme conference using g729?

[Tilghman Lesher]

On Tuesday 02 October 2007 16:55:52 Brian West wrote:
> On Oct 2, 2007, at 4:42 PM, Mark Quitoriano wrote:
> > anyway still if there's a hack for meetme to work with g729 codec
> > this won't be an issue. So is there a hack or patch that i can use
> > any codec for meetme? tnx
>
> You still do not understand.  It doesn't matter if the call coming in
> is g729 you must transcode it to signed linear, mix the frames and
> then code it back into g729 you end up with quality loss doing that.

Or, in other words, you cannot mix compressed data.  You must first
decompress the data for mixing, then recompress it for transmission.
During both operations, there is a potential for signal degradation.

-- 
Tilghman