Epson ESC/VP21 User Manual page 36

P Pulse Dialing
P, placed ahead of a number, tells the modem to dial a number
using pulse dialing.
R Reverse Originate Mode to Answer Mode
R, which can only be placed at the end of the dial string, tells the
modem to change from the originating mode to the answer mode
once it dials all the digits before the R. This modifier is used to
call an originate-only modem,
Dial a Stored Number
S
S is used to dial one of four numbers stored in nonvolatile mem-
ory. For example, instead of entering a dial string, you can use
this command:
Command: ATDTS=1<CR>
T Tone Dialing
T, placed ahead of a number, tells the modem to dial a number using
touchtone dialing,
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COMMAND REFERENCE - 2