Things CRA Should Invent: automated phone system tells you whether they've actually called you

I recently had to call CRA to deal with some boring grownup stuff.

Everyone I talked to was awesome and helpful and extremely patient with my ignorance, the boring grownup stuff got dealt with, but before that could happen I had to wait half an hour on hold for someone to help me.

This is a problem in light of the ongoing telephone scam where they call you and impersonate CRA.

CRA encourages you to call their 800 number if you're unsure about the legitimacy of a call you received, but that's a problem when the hold times are so long - especially since they're only open 9-5 Monday to Friday.  Someone who also works 9-5 Monday to Friday, only gets half an hour for lunch and isn't at liberty to make phone calls while working might not ever be able to get through!

I propose a solution: CRA should have an option to automatically detect your phone number and have the automatic system tell you whether they're trying to get in touch with you.

For example, "If you've received a call claiming to be from CRA and would like to confirm whether CRA is trying to get in touch with you, press 3."

I believe this is technologically possible.  When you call Rogers, their system says something like "I notice you are calling from a phone number ending in ####. To talk about the account associated with this number, press 1."  This means an automated system can compare the number you're calling from with numbers in a database, and route your call accordingly.

CRA could maintain a database of "numbers we have called and left messages with", and have an option in their automated system to compare callers' numbers with this database.  That way, callers who are trying to check whether the CRA call they received was a scam can get a quick, automatic message saying "We have not made any attempt to contact you by phone, no action is required on your part."

In fact, since this could be done automatically, it wouldn't even have to be done during business hours!  You call whenever, press 3, and you get a message saying either "We have not made any attempt to contact you by phone, no action is required on your part" or "We have been attempting to contact you by phone, please call us back during business hours."

This way there are far fewer barriers to avoiding scams, and human telephone representatives could be freed up for work that actually requires humans.

Other organizations that are frequently impersonated by scam callers (banks, utilities, etc.) could also use this system. I just think it's particularly important for CRA given their limited business hours and long hold times.