Temporarily out of service or phone off the hook or the "trunk" across which calls travel is busy. The signal is called a reorder tone. https://en.wikipedia.org/wiki/Busy_signal
Means it’s off the hook
Fast tone is usually no signal. This could be a tower out or your phone receiver not working.
Perhaps you inadvertently set the phone to not accept voice mail. I've done it several times just by hitting a certain set of characters. If you can't find it in the manual, contact your service provider.
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