1A2 phone system

From: Passer, Michael W. <PasserM_at_umkc.edu>
Date: Wed Mar 13 14:46:24 2002

People even used to put key-switch locks on the phones that were wired
to disable the dial so that someone couldn't make unauthorized calls if
they had physical access to the phone.

...

Which were (and are) trivially circumvented by flashing the switchhook
the n times, where n is the digit you wanted to dial, and pausing a
second or two in between each digit.

--Mike
Received on Wed Mar 13 2002 - 14:46:24 GMT