3Com Courier, Reference

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Making International calls 5-5
Hanging up If you want to end a connection with a remote device do the following:
1 Enter Online Command Mode by typing
+++
2
Wait 1 second
3 Type
ATH
Making
International calls
You can use the AT
n
and AT&G
n
commands for making analogue
international calls above 1200 bps.
Handshaking options
The ATB
n
command controls the handshake options.
.
Example: Sending
ATB1
, will allow your modem to use Bell answer tone
(selecting HST modulation).
Guard ton
The AT&G n command only applies to analogue international calls at 240
or 1200 bps.
If you set &G2 you must also sen
ATB0
to the modem. This setting
allows the Courier V.Everything modem to answer all calls from overseas.
If you want your modem Command
To answer all V.34-type calls, as well as calls from abroad,
use ITU-T (formerly CCITT) answer sequence.
ATB0
(Default)
NOT to answer V.34-type calls. Use Bell answer tone. This
setting selects HST modulation.
ATB1
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