If some one wants to read a lot more details an out this incident, there is book about it. It’s been a decade or two since I read it, but I remember it being well written.
‘The Day the Phones Stopped Ringing’ by Leonard Lee
‘The Day the Phones Stopped Ringing’ by Leonard Lee
Definitely going to look into this! The whole *ESS architecture still underpins a lot of the telephony system. There are quite a few still running, even though other TDM equipment is being phased out.