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faxlib, fm sending out pcm without stop

hi,

i'm using fiu with fm to receive fax over PSTN,

i use the pcm file "pcmIn2.pcm" in examples of faxlib as input, and save output pcm into file.
after receive DIS command from fiu,i send DCS command to fiu,
but when i open the saved pcm file from fm, it seems that fm is sending PCM without stop(more than 12seconds),
what's wrong ?

attachment is the packet and pcm file. pcm is 16bit little endian.

thanks!

 3404.tmp.zip