It's actually not true that a telephone makes sound travel faster than sound. Sound travels at a certain speed through a medium, such as air, and this speed is constant. The speed of sound in air at room temperature is approximately 343 meters per second (about 1,125 feet per second).

When you speak into a telephone, your voice is converted into an electrical signal, which is then transmitted through wires or wireless communication channels to another telephone. This signal travels at the speed of light, which is much faster than the speed of sound. However, the signal itself is not sound; it is an electrical signal that can be converted back into sound at the other end of the line.

So while a telephone can transmit sound over long distances much more quickly than sound can travel through the air, it's not accurate to say that the telephone makes sound itself travel faster than its normal speed.
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