Intel 536ep based modem problem in Win2k/WinXP

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Hi, All !

My application records voice from telephone line using Intel 536ep
based modem in voice mode. The modem is "controllerless", it has DSP
and analog front end chip. OS - Win2k/WinXP.
I've got a problem using 16bit PCM compression
mode(AT+VSM=1,11025,0,0).
When PC performing I/O-intensive operations,like copying a big file on
USB flash, I've got lost bytes in recorded data flow. It's very easy to
hear that one byte is lost when using 16 bit PCM ;) ... I got a piece
of noice until another byte is lost ...
I am playing with DCB settings and flow control but with no success for
now .
I havent noticed such effect using modem based on Conexant 11252 chip,
but 16bit/11025Hz mode is essential for my task ,so I would like to use
the Intel chip.

Could anyone help to solve the problem?

.

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