This is an scam. Person impersonates an IRS agent. When asked to identify herself, the caller gave a name and spelled it - Lisa Isaacs. She then offered an ID number. She was actually asking for my daughter. When I told he she was away on vacation, she told me to have her call her back at 571-298-8564 (the same number she used to call in) because the IRS had instituted a law suit against her for tax fraud. I asked to speak to a supervisor to authenticate the call. She claimed to be a supervisor. I asked to speak to her immediate superior and she hung up. The IRS has a hotline to report these scams - please consider doing so if you receive such a call the url is:https://www.treasury.gov/tigta/contact_report_scam.shtml .