I finally communicated with my Nokia 6610i by IrDA port in my Fujitsu-Siemens Amilo Pro V2000D. It required a nasty modification in the driver code (nsc-ircc.c), but finally I got both devices talking to each other. I used gammu. Now I can send SMS messages and download/upload graphics. I'd like to modify the nsc-ircc driver so it recognizes and talks to my IrDA port nicely. Now I just commented out two lines of code that prevented the driver from loading after an unsuccessful IO port allocation.
UPDATE: As for the kernel version 2.6.16, the nsc-ircc driver works fine without any modification.