My application records voice from telephone line using voice mode on Intel 536ep-based modem. OS - Win2k/WinXP, tried different drivers, including downloaded from intel site (4.77.8.0). Tried 2 modems from different vendors, both have DQ82536EP and DY82358 ( I suppose , remarked MD1724 ) chips onboard.

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 noise until another byte is lost ...

Application uses synchronous ReadFile(), I tried different buffer sizes , DCB and timeouts settings for COM-port but with no success ...

I havent noticed such effect with Conexant 11252 modem
recording voice in 16bit/8000Hz mode, so I suspect there is a problem with intel driver.
Could anyone send this message to developers of the driver? Maybe I need to set some special settings in DCB ?

Regards
Alex Shinkin