Have you ever...
Used a telephone book
19.3%
Spoken to a (human) telephone operator
11.6%
Reversed charges on a call
7.4%
Made a call from pay phone / phone box
18.4%
Received a call on a pay phone / phone box
7.2%
Used a phone card
15.2%
Dialled from one exchange to another to route a call
2.6%
Used a rotary dial phone
18.2%
Poll ended at .

In terms of dialling through exchanges to make calls, see

https://www.ringbell.co.uk/nostalgia/AAZ.htm

STD Analogue Call Routing

@neil We tested the configuration of a Honeywell 200 modem console, by dialling out via Dublin, somewhere else now long forgotten and then back to our Burroughs TC500 in Bournemouth.

Seemed to work OK and we moved the TC500 to Dublin.