problem of G.722.1 Annex C decode

  Hello all,

      I receives G.722.1_C rtp packets(174byte 20ms),from which extract raw data(120byte 20ms ) and save as a file,  then I decode the file  to PCM format (the  decoder I download from ITU websit,by the ITU-R Rec.G.722.1), but it just silence and bursts of noise(most byte of the PCM file is "0X00" ). I change bytes order and bits order ,nothing work. so what's the right order of bytes and bits in a frame?

      I download and install IPP 2018 update 2, but I can't find the sample code of G.722.1_C .  

     Thanks for help

      Oscar