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walrus01

see also, historical Bell System and other recordings/error messages:

https://www.thisisarecording.com/Bell-System.html

https://telephoneworld.org/telephone-sounds/modern-north-ame...

Fairly easy to download and use on your own voip system if you want.

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This is a nice collection of recordings of and about the phone systems of the 70s:

http://www.evan-doorbell.com/production/group1.htm

https://www.thisisarecording.com/ATT.html

I'm wondering what do these codes at the very end of some AT&T recordings mean? "312 8L" seems to occur on 5 totally different ones.

If you dig into Evan Doorbell's stuff, he explains this nicely. It has to do with where the intercept was caught (the particular CO / switch level / device).

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