Regarding multimedia session in windows live messenger

Hi All,

I have posted this query before also,didnt get any reply.
"Can anybody help me in resolving a problem while
doing audio conversation in Windows Live Messenger.I am getting rejected
encryption in base64 encoded SDP format,as i am trying to get network
packets while doing MSN chat.So not able to find out the actual audio
encrypted data.
But I am able to do voice chat.Please help."

If not possible to help in this regards ,can anybody tell me how is MSN
multimedia data encrypted in network???
I know it uses SDP to format multimedia session,but i am unable to get the
actual voice data/video data from the network packet i have recieved.

Thanks In Advance
Madhu