Panasonic · KX-TG/TGF Series
The phone is set to use pulse (rotary) dialing. This is for older phone lines that do not support tone dialing.
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If you cannot make calls, check the 'Dialing mode' setting (MENU #120) and change it to 'Tone' if your phone line supports it.
Ensure the 'Pulse' setting is selected if you have a rotary/pulse phone line.