Hi, I am looking for ACM Driver files that can support G.729 Audio Codec. Where can I find /download such kind of drivers written for MSN Messenger? Or how can I write such kind of file? How can I integrate audio codecs into MSN Messenger or Windows Media Player? For example MSN Messenger and Windows Media Player use msg723.acm file to make G.723 audio compression. I want to develop such kind of applications for MSN Messenger because a lot of people have Messenger already installed in their PCs and Messenger also supports SIP(Session Initiatiýn Protocol). Thanks.