User`s manual

U.S. Robotics I-modem Command Reference
Dialing, Answering, and Hanging Up • Page 3-7
Note If S0=0, Auto Answer will be disabled. Send ATI4 and be sure that
S0=1*255.
Disabling Auto Answer
To disable Auto Answer, set an I-modem to answer on zero rings with the following com-
mand:
ATS0=0 <Enter>
Hanging Up
To end a connection with a remote device, type the following:
(wait 1 sec) +++ (wait 1 sec) ATH0 <Enter>
Making International Calls
Two commands apply to analog international calls above 1200 bps: Bn and &Gn.
Bn Handshake options.