How to issue AT-Commands?

[sh]

Hi list,

I am confused. Some time ago i used libgsmd-tool to issue AT-Commands
directly to the GSM Modem. Now it seems the qtopia phone library is used
for that part. Since (HS)CSD is not covered by that library, I either
need to either extend that library or issue AT-Commands myself.

According to the documentation for that library there is no function to
issue AT-Commands directly.

How can I communicate directly to the Modem without disturbing other
applications?

Best regards,
  Soeren Heisrath