24
Note that this mode can cause problems with PBX systems — for example, systems where a 9 is
dialed to get a dial tone outside a company’s in-house phone system. Such systems deliver a second
dial tone after receiving the first digit.
With PBX and similar systems, include the
T
or
P
command in the dial string.
D
ISABLING
C
ALL
W
AITING
If you have Call Waiting, we recommend that you disable it before using your modem. If you don’t
disable it and a call comes in while you are online, you may either lose data or be disconnected.
Please refer to your local telephone book or phone company for directions on how to do this. In
many locations, you can disable call waiting by placing
*71
or
*70
(followed by a comma to
pause the dialing command for two seconds) in the dial string, either just before or after the
number you are dialing. For example, you might use:
AT DT *71, 555-0000 [CR]
Call Waiting usually resumes immediately after you hang up, so you have to do this on each call. If
your software has a built-in dialing prefix (or macro) you can probably include this code so it is
used on every call.
