I just notice another problem with H263 video. When using openmcu with polycom pvx clients, the video is ok when 2 endpoints are connected, when i connect a third pvx software, the video freezes but the audio keep ok. Openmcu and endpoint seems like send receiving data/audio/video. When i connect a fourth pvx endpoint, it shows the frozen video and audio is ok. stats of send/receive data shows traffic too.