The ring signal sent to a phone to make it ring, whether it is from your local telephone exchange or an ATA, can be between 70 and 120 volts AC. That may sound low compared with mains electricity, but it is an AC signal with a frequency of 20 Hz, compared to the 50 Hz of a mains supply.
The lower frequency means that your body is more likely to respond in such a way as to prevent you letting go of the wires that are pumping the signal through you.
This is not the best way to discover whether or not your heart is in full health!
DO NOT MESS WITH ANY ELECTRICAL APPLIANCE UNLESS YOU KNOW THAT YOU KNOW WHAT YOU ARE DOING!
Other related posts:
Old phone ringer working
Old phone plan
Some useful advice about the wooden phone
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