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I never read up on things of the telephone!
I was only going off what the old physic's teacher said;
"A telephone is NO and is closed when the handset is lifted"

I've frankly never heard of AC on this DC system. Guess it makes sense
per the diagram. DC couldn't pass through a Capacitor can it/could it?
Thus my statement about not seeing the AC power, IE is drained off
with the Cap. and also helps the bell ring.

I'm not ever sure of the use of a triac in the handset but both
AC or sparingly(singulary) for DC can be used by a design.

By no means am I an electronic geek.
 
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