Businesses researching call answer rates almost always run into two terms: CNAM and STIR/SHAKEN. Both get treated like they’re part of the solution. Neither one is.

CNAM is a legacy landline tool that doesn’t include mobile — where the vast majority of your calls are landing. STIR/SHAKEN authenticates that a call isn’t spoofed, but it never displays your business name to the person receiving it. If your goal is getting recognized and answered, neither one does the job.

We covered the real toolkit for call answer rates in The 3 Essential Tools You Need to Get Your Calls Answered in 2026. This post exists to clear up why CNAM and STIR/SHAKEN aren’t on that list — and why STIR/SHAKEN is sometimes sold as a branding fix it was never built to be.

CNAM: Built for Landlines, Not Your Customer Base

CNAM (Caller ID Name) is the original caller ID name-lookup system — and it’s a landline-era technology. It doesn’t reliably function on mobile networks, which is where the overwhelming majority of consumer calls are now received. If your customers are calling or being called on a mobile device, CNAM is often not even in the picture.

Bottom line: CNAM is not built for a mobile-first calling environment. It’s not a tool you should be building a strategy around.

STIR/SHAKEN: Authentication, Not Branding

STIR/SHAKEN is a carrier-level framework that verifies a call’s caller ID hasn’t been spoofed and attaches a level (A, B, or C) that signals trust to the receiving carrier. It’s valuable infrastructure for the phone network generally — but it does not display your business name anywhere on the customer’s screen.

Bottom line: STIR/SHAKEN can tell a carrier a call is legitimate. It can’t tell a customer who’s calling or why — which means it isn’t going to move your answer rates.

STIR/SHAKEN vs. BrandDelivery: Why They Get Confused — and Why They Shouldn’t

Some providers market STIR/SHAKEN compliance as if it were a branding solution, or as good as one. It isn’t, and the distinction matters if you’re deciding where to spend your calling-trust budget.

STIR/SHAKEN authenticates. It verifies a call’s caller ID hasn’t been spoofed and attaches a trust level (A, B, or C) that the receiving carrier sees. That’s a real, useful function — but it stops at the carrier. It was never built to display anything to the customer. 

BrandDelivery is built to solve the part STIR/SHAKEN can’t reach: it registers your numbers directly with carriers, displays your verified business name on the recipient’s screen, and continuously monitors and remediates spam flags.

So if a business is being told STIR/SHAKEN compliance will make their calls look trusted to customers, that’s not accurate — it makes calls look trusted to carriers. The customer still sees an unnamed number with no context, which is exactly the problem branding is meant to solve. STIR/SHAKEN and BrandDelivery can technically run alongside each other, but they are not substitutes, and treating STIR/SHAKEN as a branding play is where businesses get misled.

For a business deciding where to invest, BrandDelivery is the option that actually delivers what STIR/SHAKEN gets marketed as: a call your customer recognizes and answers.

Spam Monitoring and Remediation: The Piece Only BrandDelivery Includes

Even a fully registered, branded number can get flagged as “Spam Likely” by carrier algorithms over time — what we call a number “going hot.” Neither CNAM nor STIR/SHAKEN does anything to catch or fix that. That’s a separate function: spam monitoring watches your numbers continuously, and if one is flagged, remediation gets it fixed with carriers, typically within 24 hours.

Between carrier registration, branded display, and spam monitoring and remediation, BrandDelivery covers the full picture — without needing CNAM or STIR/SHAKEN layered on top.