Some evolutions in my attempts to connect my Indy to the Internet using a modem.
I have found out that either the Indy Serials ot my adaptor cable (is one of the °spacemouse° adaptors) is not working correctly with the hardware handshaking.
Changing the modem configuration to use ttyd2 instead of ttyf2 (the "f" was selected by the installer) made me able to make an actual call.
It seemed to work before cause the default port speed for the USR28800 is 115200 and hence the Indy messed up totally when tring to get the "OK" from the modem.
Now I can place the call, but I still have problems as it seems that my machine and the ISP are not able to negotiate the IP address for the port.
I have a trace available if some expert is willing to help me!