i got "An audio error occurred" error message when receiving call using voipui app

From: gh,kim (bestnationis_at_korea.com)
Date: 03/29/04 

Date: 29 Mar 2004 02:31:52 -0800

hi all,
i'am new voip app, so it is so hard make app to me.
please give me any information.

i got a audio error in voipui App' as i written in subject.
i'am using ce.net 4.2 and included almost audio codec
but ringing sound is ok.

has any one got this error?
and why this error maded?

tested in intel 815 board.
please let me know...