4.Manual dial: Set the modem to synchronous mode (&M1 or &M3), then dial a number from a telephone set. When you hear the answer tone, type ATD (if &M1 is set). The modem will go into synchronous operation after connection.
Answering from Synchronous Mode
Auto-Answer
Set the modem to synchronous mode. Set the
Manual Answer
Type ATA from the terminal (if &M1 is set).