WARNING!
GVC is like jack-in-box: Cirrus Logic or Rockwell or something else inside and no differencies outside.
All followed settings are related to the GVC modem with the
Rockwell chipset RC144DPI (model F-1114HV/R2 3.04
and similar).
AT&FPL1&E1%L9 OK AT\C1\K3\N5\T5\T5S7=120S10=30 OK
%L - transmission power, -dB (0...15). Default - 11.
P - pulse dialing. Default - tone.
\C - MNP command, data buffering during handshake.
\K - break handling.
\N - connection mode (normal, reliable, auto).
Here exist one special trick: ATB2 which is used to
hold the connection speed between 1200 and 9600. Default - B0.
Modem index
Author of this warp