> Indeed ... depending upon the telephone switch you can still manually dial a
 > number by rythmically clicking the receiver "on-hook". In
the newer exchange
 > this is not possible anymore, but some still do ... I figured this was a nea
 > feature to still dial a number even if the keyboard was disfunctional.
 >


I have done that with a circa 1920's telephone .  No dial, no
number pad just an ear piece and a mouthpiece 

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