In the ARQ, I have disabled the options to edit both the phone number and the extension.
In SU01, I have tried a variety of other patterns and they do not get changed after the ARQ is submitted. As an example, all the below patterns do not get changed, which is good.
Phone number = 12345678900000 and no extension
Phone number = 1234567890 and no extension
Phone number = 1234567890 with extension 0000
I do not want to have a standard format, as the business can currently modify this information if required.
P.S. I also tried the format 123-456-7890 with extension 0, and it changed the phone number to 1234567890 with extension 0.