Thx to Jean for the tutorial on IrDA. with the magic command "echo 9600 > /proc/sys/net/irda/max_baud_rate" I finally managed to have a PPP activated on a Nokia 6200 !
Unfortunatly I need to have a speed set to 115200 bps at least (with GPRS EDGE handsets the TCP throughput is over 150 kbits/s)... is there any way to change this value once PPP link is up ? It's stuck to 9600 bps now !
My kernel version is 2.4.18-24 (redhat 8.0)
My pppd version is 2.4.1
Modules used : girbil, ircomm, ircomm-tty, irtty and irda