When I am connected to OpenMCU using PVX, I notice that the bitrate coming from OpenMCU varies quite a bit. I have the bitrate set to 1920 Mbps but actual call rate is 1856 and the actual bitrate bounces sporadically never hitting the maximum bitrate consistently. Sometimes it goes above the call rate and then back down. Is this something that H323+ handles or is this handled by the codec?