Coastcom D/I Mux III System User Manual page 276

D/I Mux III User's Manual
The Smartmodems also include S-Registers, permitting selection of rings before answering. Table I-7
lists and describes the S-Register options.
S- Register
S0=n
S0=0
Table H-7. Smartmodem S-Registers
Description
Auto-answer mode where n = the number of
rings before the modem answers, OR
0 = do not answer.
For other S-registers refer to the particular
modem's user manual.
256
Appendix G. Modem Interfaces