[asterisk-users] music on hold file formats

[Ron]

Hi,

what software do i need to convert an mp3 to a g729 format?

I have a portal where a user can upload their own MP3, but when a user 
is using a g729 codec, the music on hold has a crackly sound. using g711 
it's very clear.

so what i'd like to do is when they upload an MP3 i will make a copy on 
g729 format, so that asterisk can choose which file to play depending on 
what codec is being used by the user.

TIA

Regards
Ron