Apple Express Fax/Modem - Manual (Page 131)

T Touch-Tone dialing All subsequent numbers are Touch-Tone
dialed until the P command (for pulse dialing) is selected.
P Pulse dialing Selects pulse dialing, with the dialing speed fixed at
10 pulses per second.
You can mix Touch-Tone and pulse dialing within the same
telephone number. The digits immediately following a P command
will be pulse dialed; those following a T command will be
Touch-Tone dialed.
, Pause The comma modifier introduces a delay time before dialing
the next dial character or executing the next character in the dial
string. The pause time is the value of the S8 register (default=2
seconds).
W Dial tone detect The W modifier is used to make the modem detect
a dial tone before sending the next digit. If the tone has been
detected by the modem before the S7 register time delay, the
modem continues dialing the rest of the characters in the dial
string. If no tone is detected, the modem goes on-hook, returns the
NO DIAL TONE result code to the host, and enters the local
command state.
This modifier can be embedded anywhere in the dial string.
Example: ATDT9W5551234.
: Calling Card tone detect Same as W. The colon can detect most
calling card tones. Place the colon in the dial string when you want
to detect a wider range of frequencies.
@ Wait for quiet answer before dialing For the time specified in the S7
register (default=50 seconds), the modem attempts to detect 5
seconds of silence. This period of silence confirms that the call has
been answered. When 5 seconds of silence are detected, the
modem dials the remaining numbers in the command line. The
remaining numbers may be a security code, another telephone
number, or an extension. If no quiet time is detected, the modem
hangs up and returns NO ANSWER. The following is an example
using the @ modifier:
atdt312555-1432@4622
119 M O D E M C O M M A N D S E T