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Possible Cause 1: Dial Mode is set incorrectly.
What to do: Find out if you have touch-tone or rotary service and check the Dial Mode
(#201)
setting.
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If it is set incorrectly, change it, then try to make a call. If you can make a call, the
problem is solved.
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If the Dial Mode is already set correctly, go to Possible Cause 2.
Possible Cause 2: Someone may have changed the Outgoing Call Restriction setting.
What to do: If you were able to make a call without any trouble before, check the
Outgoing Call Restriction (#401) setting to make sure it was not changed.
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If it is set incorrectly, change it, then try to make a call. If you can make a call, the
problem is solved.
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If the Outgoing Call Restriction is already set correctly, go to Possible Cause 3.
Possible Cause 3: Local phone company is not accurately receiving the dialing signals.
What to do: Isolate the problem. Use the telephone to make calls on different lines. Then,
make calls on different phones using the same line.
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If you cannot make calls from one phone on all lines, follow the procedure for “Other
Problems with Phones,” Possible Cause 2.
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If you cannot make calls using different phones, go to Possible Cause 4.
Possible Cause 4: Too many standard devices trying to dial simultaneously. (If the
problem is on a system phone, go to Possible Cause 5.)
What to do: Stay on the line and wait for dial tone, or try your call later.
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If you can make a call, you may want to expand system capacity to avoid future
problems. Call the hotline.*
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If you wait 30 seconds and still do not hear a dial tone, go to Possible Cause 5.
Possible Cause 5: Local phone company line is faulty.
What to do: One at a time, unplug each outside line from the system module(s). Then
plug each line into a standard telephone and try to make a call.
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If the trouble appears on the standard phone, try another line cord; if the trouble
persists, report it to your local phone company.
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If the trouble does not appear on the standard phone, the trouble is with your system
module(s). Call the hotline.*
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In the continental U.S., help is available at 1 800 628-2888. Outside the continental U.S., call your AT&T
Representative or local Authorized Dealer.
Troubleshooting 6-3