What is the voltage of a telephone connection?

What voltage on the telephone line during a call, call and inaction? AC or DC?
June 10th 19 at 16:16
1 answer
June 10th 19 at 16:18
During idle time - constant 60V;
During a call, the variables for the 48 - 110V (25 Hz);
While talking - constant 20V.

All the values change depending on which telephone station is used.

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