That I can’t tell you. My Graphene phone broke and I’m using a Googled phone at present (bleh).
I checked Graphene’s features page, but this was all I could find:
Call recording functionality within the Dialer app using modern Android storage with recordings stored in Recordings/Call Recordings and no restrictions based on region or special cases like playing a recording tone (users are still responsible for complying with their local laws).
IX was the best 😎