[h323plus] H264 PLUGIN in h323plus

Hi All, For the libx264, It directly fragment the encoded data if it larger than the maxpayloadsize (1.4KB by default). If I had encoded data 5.6K. Then, it will fragment and sent out, 4 times. Is it comply to H.323 standard? Because currently other voip (polycom, Mirial...) can't display my encoded data size greater than 1.4K. Thanks.