Multi-Tech Systems MT5600ZDX - Manual (Page 21)

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Owner’s Manual
modify as well. Note that you can return to the modem's default configuration
by entering AT&F.
If your application requires modification, use the command strings shown below
corresponding to your application:
4 If the modem reports NO DIALTONE, check that the modem’s telephone 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 may 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 may be installed behind a company
phone system (PBX) with an internal dial tone that sounds different from the
normal dial tone. In that case, the modem may not recognize the dial tone and
may treat it as an error. Check your PBX manual to see if you can change the