[h323plus] H264 PLUGIN in H323Plus

Hi All, Currently, my H264 plugin able to work with polycom. I found that the media statistic(polycom PVX ) only show the frame rate video format, and display the image if my sending encoded data is not more than 1.4KB. In my code, I do the fragmentation once it greater than 1.4KB(like libx264 do). However, I had read some documentations and all of them mentioned about H.241 only support the single NAL unit mode(mode 0). I wonder how this mode handle if encoded data greater than 1.4KB(usually happen)??? Any Idea? Thanks.