hung nguyen - 2009-11-04

Hi everyone.
Flowing my knowledge; in  video conferencing, RTP is used for streaming audio and video and RTCP is used for control synchronization audio and video.
In Dimdim open source, it use Red5(RTMP) for streaming audio and video, but how do it  synchrony audio and video? Can it has ability to control audio and video synchronization as RTCP.
I used dimdim_VMware_v4.5 and audio is lag.