HI   Simon and Jan 
       after enabed the  H235 media encryption, openmcu and H323 ep  in the same network were work well  .  

    however , when they were in different networks£¬
    1 .  only audio PDU£¨200bytes£©received at MCU , MCU can not receive video pdu£¨above 1000 bytes£©.i am sure the ep had upload the audio and video packages .
 2.  the threads used for trasmit and receive data had been create  , but no data send to H323 ep .  some messages  hint that    PTLIB write Blocking  £¬but i don¡®t know why ,   use fcntl() to set read/write NONBLOCKING , But not effective   .
    please help  
    thanks
      


    gary