3Com U.S. Robotics 56K Voice, Command Reference Manual

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4-6 C
HAPTER
4: D
IALING
, A
NSWERING
,
AND
H
ANGING
U
P
Guard tone The AT&G n command only applies to analog overseas calls at 2400 or
1200 bps.
If you set &G2 you must also send
ATB0
to the modem. This setting
allows the Business Modem to answer all calls from overseas.
Make/Break Ratio
The AT&P
n
command sets the off-hook/on-hook (make/break) interval for
pulse dialing.
Call Detection
Call Detection allows the modem to recognize whether an incoming call
is analog data or fax.
Call Detection is an optional Service Class 2.0 feature and is also
implemented by 3Com for Fax Class 1 applications.
To set your modem for Command Required in these countries
No guard tone
AT&G0
(Default)
United States and Canada
550-Hz guard tone
AT&G1
Some European countries
1800-Hz guard tone
AT&G2
The U.K. and some Commonwealth
countries
To set you modem for Command
North American make/break ratio (39/61)
AT&P0
United Kingdom make/break ratio (33/67)
AT&P1