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The Modem Dials But Cannot Connect
There can be several reasons the ZBA fails to make a connection. Pos-
sibilities include
• lack of a physical connection to the telephone line.
• a wrong dial tone.
• a busy signal.
• a wrong number.
• no modem at the other end.
• a faulty modem, computer, or software at the other end.
• incompatibility between modems.
You can narrow the list of possibilities by using extended result codes.
Extended result codes are enabled by default. If they have been dis-
abled, enter ATV1X4 and press ENTER while in terminal mode, or in-
clude V1X4 in the modem’s initialization string. When you dial again, the
modem will report the call’s progress.
If the modem reports
NO DIALTONE
, check that the modem’s tele-
phone line cable is connected to both the modem’s LINE jack (not the
PHONE jack) and the telephone wall jack. If the cable looks secure,
try replacing it. If that doesn’t work, the problem might be in your
building’s telephone installation. To test the building installation, plug
a telephone into your modem’s telephone wall jack and listen for a
dial tone. If you hear a dial tone, your modem might be installed be-
hind a company phone system (PBX) with an internal dial tone that
sounds different from the normal dial tone. In that case, the modem
might not recognize the dial tone and might treat it as an error. Check
your PBX manual to see if you can change the internal dial tone; if
you can’t, change your modem’s initialization string to replace X4 with
X3, which will cause the modem to ignore dial tones (note, however,
that X3 is not allowed in some countries, such as France and Spain).