Serial port modem connection

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I have a GPRS modem that I want to use for internet connectivity on my
CE device.

My CE Platform has 3 serial ports - and I have first-third instance of
serial port configured in PB.

Hardware-wise, the platform's BIOS assigns 3F8 to COM1, 2F8 to COM2 and
2E8 to COM3. CE grabs 3F8 for serial debug and 2F8 becomes the new
COM1. I notice CE sets 2E8 to be the new COM3. If I create a direct
connection, only COM1 and COM3 are available but if I get the available
COM ports programmatically, I get COM1 and COM2.

My problem is I cannot get serial comms working with the modem, but it
works fine if I set up a direct serial connection between the CE device
and a host PC (visible in hyperterminal as the CE device polling
"CLIENT CLIENT..."). Creating a modem connection via the CE default
"Hayes" modem on COM1 works without any issue but does not work with my
modem entry below on COM3 (I get a "Port is not available: another
program may be using it" message).

I create the additional modem connection in the registry as follows:

[HKEY_LOCAL_MACHINE\ExtModems\WaveComm]
"Port"="COM3"
"DeviceType"=dword:1
"FriendlyName"="WaveComm Modem on COM3"

I have tried changing COM3 to COM2 without success. There seems to be
something I am missing settings wise or in the registry but after all
my help trawling and registry analysis I cannot figure out what (the
fact that I can't see the CE registry remotely doesn't help either -
see my other post)

Any ideas?

.

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