There was a concern (I don't understand) the candle stick
> phones of that time would sense an erroneous pulse that
> would confuse SxS gear, thus the 11 code. Why this
> wouldn't screw up panel gear I don't know. Once 'sticks
> went away the issue was moot.
It's possible to make a false preliminary pulse with any
> analog phone, not just candlesticks. A false preliminary
> pulse equates to dialing a 1 no matter what kind of
> equipment is at the other end, even ESS. As we've
> discussed on this list any number of times before, an
> experienced high school kid can dial any number by
> punch> According to the Bell System history, the problem was
> unique to candlestick phones. Why only those phones, I
> don't know. I'll have to read up on it to get more
Let us know the details after you've read up on it.
I can understand that the physical architecture of a candlestick phone would make it more likely that a user could inadvertently make a false preliminary pulse. But that doesn't preclude the possibility of making a FPP with any type of (non-VOIP landline) phone. Electrically, any type of switching equipment would interpret any pulse of about 1/2 second duration as a dialed "1".
Try this: pick up your landline home phone, then press and release the switchhook as fast as you can. Note that dialtone goes away. You just dialed "1".
Or try dialing 215-221-1111 with the switchhook. It might be a bit tricky dialing that "5", but if you reach Sam's Kitchen Supply, you did it correctly.