Nortel M2000 Reference Manual page 91

24 Keyboard dialing
Procedure 17 describes auto-answering a Hayes KBD data call.
Incoming calls are answered automatically if Register S0 is set to any
value between 1 and 255. This value is the number of rings before the
incoming call is answered by the MADO.
Note: No audible ringing is provided by the MADO for manual or
auto-answering. The RI lead of the RS-232-C connection is high for
2 seconds and low for 4 seconds. This cycle is counted like physical
ringing.
Procedure 17 Answer a Hayes KBD data call automatically
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Use Procedure 18 to answer a Hayes KBD data call manually. If
Register S0 contains 0, the MADO does not answer automatically, and
the data call must be answered using the ATA command.
Procedure 18 Answer a Hayes KBD data call manually
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555-4001-110 Standard 09.03 July, 2002
Screen Display:
RING
Response: MADO detects the incoming call.
Response: MADO counts rings up to the value of Register SO.
Screen Display:
CONNECT
Response: System establishes data connection.
Screen Display:
RING
Response: MADO detects the incoming call.
Response: MADO counts rings up to the value of Register SO.
Type:
ATA
(CR).
Screen Display:
CONNECT
Response: System establishes data connection.