[Asterisk-Users] MEETME core uses ulaw?

[Kevin P. Fleming]

Dan Morin wrote:
> Thank you both for your responses.  From looking at the app_conference
> page in the wiki, it seems as though it is best used for one or two
> speakers and everyone else just listening.  Unfortunately, my company
> likes to have conferences with 15 or so people and everyone can talk.

There is no way to bridge (mix) compressed audio streams together. They 
must be decompressed into some simple audio format, mixed, and then 
recompressed.

app_conference can do a little better when all the callers are using the 
same codec and only one is speaking, because then it does not need to 
mix the audio together. Anytime mixing is required, though, the audio is 
going to be transcoded.