This is the short step before anyone opens a calendar. The number on the form does more work than the phrase printed on the letter.
A 1040 conversation is not a 1065 conversation. Form 1120-S is not Form 1120. Interest is not either filing charge. The form number is how those stay apart.
Send the form number and the year printed on the notice. The row gets a name before anyone discusses a figure. If two forms are in the envelope, send both, and keep them in two lines.
Working out which charge a letter means, and keeping the books that stop the next one, is what happens here. A hearing, an appeal or any filing made on your behalf as your representative belongs with a firm that does that work, and no CPA license sits at this desk either, so signed reports on your statements go elsewhere as well. You'll hear both of those early rather than late. The longer drawing of the limit lives on the disclosures page.
From there you can read the IRS page that matches, or you can ask for a time. Both are allowed.
You are not signing anything by naming the form.
One form number is a complete message. Two, if the envelope really has two.
You will be talking to the Steven Palmieri practice.