ZyXEL Communications U-336R, User Manual

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Synchronous Mode Operation 33
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 S-register S0 to equal
the number of rings before auto-answer occurs. Set it from the
terminal (if &M1 is set) using the asynchronous AT command, or
select the STATUS REGISTER menu to change the S0 value.
Manual Answer
Type ATA from the terminal (if &M1 is set).