3 ms·
Never heard of the systems with this flaw. It was always "if you hang up then it's completely cut".
by de_watcher 7y ago
Never heard of the systems with this flaw. It was always "if you hang up then it's completely cut".
- dboreham 7y agoPerhaps it worked on Strowger exchanges when the call is local? I definitely remember this being "a thing" back in the 1970s but I don't remember ever succeeding in reproducing it. Obviously there must have been some time out because otherwise you could DoS anyone's phone by just calling them then not hanging up.
- Khoth 7y agoIn the UK, when exchanges moved to digital, they deliberately kept the old behaviour because some people relied on it (eg, hanging up their main phone, then walking to another room and picking up the call on an extension phone), with a timeout of a few minutes. In 2014 they reduced the timeout to 10 seconds to make this fraud harder to pull off. https://www.openreach.co.uk/orpg/home/updates/briefings/downloads/wlr00314.pdf https://www.openreach.co.uk/orpg/home/updates/briefings/down...