[asterisk-users] 'Slower but cleaner' G711 option

[Adam Moffett]

When you compile asterisk from source there's an option to enable an 
alternate G711 algorithm which is stated somewhat cryptically to be 
"slower, but cleaner".

Does anybody have the authoritative answer as to what the deal is with 
this?  I saw a forum post from somebody who said something about it 
handling faxes better, and only being marginally slower.

If it produces better audio, and isn't much slower why isn't it the 
default option?