Curtis STC924 Owner's Manual page 31

Problem Solving
If after pressing the Talk button, you receive three "beeps" and no dial tone, check
the following:
1. BASE UNIT is plugged into a power source.
2. If you had a power failure or had unplugged the BASE UNIT, replace the
HANDSET on the BASE UNIT for 2 to 5 seconds to reset the system.
NOTE:
If none of the telephones in the house are working, disconnect one set at a time to
verify that none of the phones are causing the problem. If you still have a problem
after doing this, and your telephone still does not work, please contact your local
phone company.
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