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German Telekom approved GVC modems

(GM-144VBIS+ RC9696/14 (?))

This modem does not(!) use Xon/Xoff flow control. Further, the default modem profile sets `&S1', which makes the modem disable DSR all the time. On systems using the FAS serial driver, this will disable CTS flow control!

So, #define FAX_MODEM_HANDSHAKE "AT\\Q3&S0" in `policy.h', do not define FLOW_SOFT for flow control, and fax sending should work. (It does for me!) Changing FAX_SEND_BAUD to B19200 is not necessary, it works with B38400.

Fax receiving... I did not fully test it. It's somewhat difficult since that modem insists on using auto-answer, but it should be possible to let it auto-answer if you set mgetty's ring counter high enough. Or, you can trick the modem, by changing mgetty's answer command (ATA) into ATS0=1 -- upon the next RING, the modem will "auto-answer".

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