It may have been Jane Barbe (AT&T).

https://telephoneworld.org/telephone-sounds/miscellaneous-te...

I believe (unable to fully verify) she got a credit in the 2017 album “Is This The Life We Really Want? — Almost 40 years after the release of The Wall”.

https://www.discogs.com/release/10441646-Roger-Waters-Is-Thi...