I have 2 external serial modems (Trendnet TFM-560X), working perfectly. Recently I purchased a new server which comes with only USB connections. So I bought a serial to USB adapter (Prolific PL2303) which has a good kernel support. I recompiled the kernel with driver and dmesg shows that the kernel found it correctly: Code: usbcore: registered new interface driver usbserial drivers/usb/serial/usb-serial.c: USB Serial Driver core drivers/usb/serial/usb-serial.c: USB Serial support registered for pl2303 pl2303 2-2:1.0: pl2303 converter detected usb 2-2: pl2303 converter now attached to ttyUSB0 usbcore: registered new interface driver pl2303 drivers/usb/serial/pl2303.c: Prolific PL2303 USB to serial adaptor driver When I communicate with the modem through minicom, every command works except ATD/ATDT: Code: Welcome to minicom 2.2 OPTIONS: I18n Compiled on Feb 26 2008, 19:24:47. Port /dev/ttyUSB0 AT S7=45 S0=0 L1 V1 X4 &c1 E1 Q0 OK ATI0 Agere OCM V.92 Ver2.7a (Jun 14 2004) Voice Mercury DP2SH mode-ii SERIAL OK ATI1 0418 OK ATI4 18 OK ATI5 OCM ,0,19 OK ATD ERROR ATDT9 ERROR I tested with 2 different kernels and it's just the same... Anyone had a similar problem? Any clue for a solution? Thanks.
