AT&T CL2909 - Manual (Page 40)

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Important safety information
Especially about corded telephones
Electrical power: The telephone base must be connected to a working
electrical outlet. The electrical outlet should not be controlled by a wall
switch.
Calls cannot be made from the handset if the telephone base is
unplugged, switched off, or if the electrical power is interrupted.
Power adapter: The power adapter is intended to be correctly oriented
in a vertical or floor mount position. The prongs are not designed to hold
the plug in place if it is plugged into a ceiling, under-the table or cabinet
outlet.
SAVE THESE INSTRUCTIONS
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Appendix C