Take a look at this article and there are many more, I included this one as it has a map. Will include more links below. In short ATT has been playing with the NSA to let them tap into the “fat pipes” or very high capacity Fibre network that carries the bulk of traffic and not just theirs
Search ATT & Room 641A and you will find lots of verified info on it
https://arstechnica.com/uncategorized/2006/04/6585-2/
https://betanews.com/2007/11/08/whistleblower-at-t-maintained-a-secret-room-for-the-nsa/
https://en.wikipedia.org/wiki/MAINWAY
I think that these links will get you started, ATT is the lead pony in this parade
Semper Fi, MAGA!!
NSA is on our side. Obama meets with ATT leadership.
Something interesting is happening at ATT for sure. Thank you for the fine info.
p.s. Read the above referenced ATT links, Ransom. Very relevant I think.