Post by account_disabled on Mar 14, 2024 8:21:38 GMT 1
It was both fun and a little scary. True things didnt go beyond study and entertainment but as far as I know there were enterprising people who stirred up business with this... zmax hours ago Alarm in communication networks author B.S. Goldstein. An excellent book it described the signal exchange protocols and frequencies on which automatic telephone exchanges communicated before the advent of numbers. As a matter of fact the possibilities for the undocumented use of longdistance channels arose from the presence of certain tolerances in the duration of signals.
Now I dont remember offhand of course but there was an option calling a regular call to a number Buy Email List with a low price usually a neighboring region after the subscriber answered the line a channel release signal was given with a duration slightly shorter than required by the standard. Those same Hz. The remote ATSKU fell off and you still had a busy intercity channel. This line had a tenday dialing frequency of I could lie and in principle you could call anywhere in the world. As a bonus your call was connected even to.
The gray box described in the article also worked but not always. A twotone packet containing the callers number could not be slipped from a number that itself issued one but there were a number of street pay phones who were silent in response to the MATS request Hz after dialing intercity access. This was done so that it would be impossible to make longdistance calls from payphones. These are the payphones where number substitution worked. And also it remains just study and entertainment.
Now I dont remember offhand of course but there was an option calling a regular call to a number Buy Email List with a low price usually a neighboring region after the subscriber answered the line a channel release signal was given with a duration slightly shorter than required by the standard. Those same Hz. The remote ATSKU fell off and you still had a busy intercity channel. This line had a tenday dialing frequency of I could lie and in principle you could call anywhere in the world. As a bonus your call was connected even to.
The gray box described in the article also worked but not always. A twotone packet containing the callers number could not be slipped from a number that itself issued one but there were a number of street pay phones who were silent in response to the MATS request Hz after dialing intercity access. This was done so that it would be impossible to make longdistance calls from payphones. These are the payphones where number substitution worked. And also it remains just study and entertainment.