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#195 serial redirection control signal problem


I am using latest rdesktop cvs (2006-04-25) to conect
to XP pro Sp2 from Mandrake 10.0 machine. I have used
command line option "-r comport:COM1=/dev/ttyS0" for
serial redirection and connected an external modem to
ttyS0 of my Linux box. I am able to add this modem on
XP and successfully diagnose it thru control panel
applet. I can also communicate with the modem using
Hyperterminal if I select COM1 port at "Connect Using"
dropdown list of Hyperterminal. However, if I select
the modem device on this list, I can not communicate
with the modem. Its always show "disconnected" message.
Below is modem log file. Same problem when I set up a
dial-up connection and try to dial a number.

It seems that there is a serial control signal handling
problem at rdesktop when modem driver used instead of
direct COM port on Windows machine. When I used
microsoft rdp client on same client device everything
works fine.

Thanks in advance for any clue.

04-25-2006 18:16:57.671 - File:
C:\WINDOWS\system32\tapisrv.dll, Version 5.1.2600
04-25-2006 18:16:57.671 - File:
C:\WINDOWS\system32\unimdm.tsp, Version 5.1.2600
04-25-2006 18:16:57.671 - File:
C:\WINDOWS\system32\unimdmat.dll, Version 5.1.2600
04-25-2006 18:16:57.671 - File:
C:\WINDOWS\system32\uniplat.dll, Version 5.1.2600
04-25-2006 18:16:57.671 - File:
C:\WINDOWS\system32\drivers\modem.sys, Version 5.1.2600
04-25-2006 18:16:57.671 - File:
C:\WINDOWS\system32\modemui.dll, Version 5.1.2600
04-25-2006 18:16:57.671 - File:
C:\WINDOWS\system32\mdminst.dll, Version 5.1.2600
04-25-2006 18:16:57.671 - Modem type: Standard 56000
bps Modem
04-25-2006 18:16:57.671 - Modem inf path: mdmgen.inf
04-25-2006 18:16:57.671 - Modem inf section: Gen556F
04-25-2006 18:16:57.671 - Matching hardware ID: moto1_gen
04-25-2006 18:16:57.671 - 115200,8,N,1, ctsfl=1, rtsctl=2
04-25-2006 18:16:57.671 - Initializing modem.
04-25-2006 18:16:57.671 - DSR is low while initializing
the modem. Verify modem is turned on.
04-25-2006 18:16:57.671 - CTS is low while initializing