If you searched "what does calls with a checkmark verified by carrier mean," the short answer is that the checkmark shows your phone carrier confirmed the number on the screen really placed the call and was not spoofed. It does not mean the caller is safe, wanted or a business you know. It only means the caller ID is authentic.
The technology behind that checkmark is called STIR/SHAKEN. For a business that makes calls, it is one of the few parts of answer rates you can actually influence. This guide covers how STIR/SHAKEN caller ID authentication works, what the A, B and C attestation levels mean, why a verified call can still show "Spam Likely," and how to think about it if you call leads from the Ready Dialer or any other calling tool.
What STIR/SHAKEN actually is
STIR (Secure Telephone Identity Revisited) and SHAKEN (Signature-based Handling of Asserted information using toKENs) are two standards that work together. Together they give a phone call something like a signed certificate.
Here is the flow in plain terms:
- Your call starts at an originating provider. This is the voice provider that puts your call onto the phone network.
- The provider signs the call. It attaches a digital signature saying who it is, what number the call claims to come from, and how confident it is that you are allowed to use that number. That confidence level is the attestation.
- The call crosses networks. The signature travels with the call over IP connections between carriers.
- The receiving carrier checks the signature. If the signature is valid and the attestation is strong, the carrier can mark the call as verified. Some carriers and handsets show this as a checkmark or a "Caller Verified" label.
US regulators required the large voice providers to implement STIR/SHAKEN on their IP networks after the TRACED Act. The goal was to make caller ID spoofing (robocallers faking a local or trusted number) traceable and easier to filter.
What does calls with a checkmark verified by carrier mean for the person answering?
The checkmark answers one question: "Is this number real?" It says nothing about intent.
- A checkmark means: the call's signature checked out, and the originating provider vouched for the caller's right to use that number.
- A checkmark does not mean: the caller is a legitimate business, the call is wanted, or the caller is not a telemarketer.
Display also varies. Whether a verified call shows a checkmark depends on the recipient's carrier, the phone model and the dialer app on the phone. The same call can show a checkmark on one person's phone and nothing on another's. A missing checkmark is not proof of spoofing. The signature can be lost when a call passes through an older non-IP (TDM) leg somewhere along the route, which still happens on some rural and legacy networks.
The three attestation levels: A, B and C
Every signed call carries an attestation level. Callers searching "verified caller ID" are usually trying to work out which level gets them the checkmark, so here they are side by side.
| Level | Name | What the originating provider is vouching for | Typical result on the recipient's phone |
|---|---|---|---|
| A | Full attestation | It knows the customer and has confirmed the customer is authorized to use the calling number | Most likely to show verified or a checkmark |
| B | Partial attestation | It knows the customer, but can't confirm the customer is authorized to use that specific number | Usually no checkmark; treated as less trustworthy |
| C | Gateway attestation | The call came in from somewhere else (often an international gateway) and the provider can't vouch for the origin | No checkmark; more likely to be scrutinized or labeled |
The practical difference between A and B often comes down to where your number lives. If you place calls from a number your voice provider owns and has assigned to your account, the provider can give full attestation. If you place calls through one provider while displaying a number hosted somewhere else (a common setup when a business "forwards" its main office number as caller ID), the provider may only be able to give B.
How to get closer to A attestation
- Call from numbers your calling provider assigns to you. Don't display a number you don't control through that provider.
- Keep your business identity consistent. Your legal name, address and the numbers you call from should line up with what your provider has on file.
- Ask your provider directly. Any voice provider, us included, should be able to tell you what attestation your outbound calls receive and what you would need to change to improve it.
Verified is not the same as "not spam"
This is the part that surprises most business callers. You can have A attestation and still see "Spam Likely" on the recipient's screen.
There are two separate systems:
- Authentication (STIR/SHAKEN): Is the number real? This is the checkmark.
- Reputation (call analytics): Does this number behave like spam? This is the label.
Carriers run call-analytics engines that score numbers on behavior: how many calls a number makes per hour, how short the calls are, how often people decline or block, whether the number calls sequential lists, and whether people complain. A fully attested number that dials hundreds of strangers a day with 10-second calls will collect a spam label anyway. Authentication only proves who is calling. It does not make the calling pattern look normal.
Things that tend to keep a number's reputation clean (general good practice, not guarantees):
- Call people who expect you. Inbound leads, form fills, people who asked for a callback.
- Pace your calls. Human-paced, click-to-call dialing looks very different from automated calling.
- Have real conversations. Long, completed calls are a healthy signal. Lots of hang-ups within seconds are not.
- Text before you call so the number isn't a stranger when it rings (more on this below).
- Register your numbers with the free carrier and analytics registration portals where available, so your business name is attached to the number.
The texting side has a direct parallel. A2P 10DLC registration is how carriers authenticate business text traffic, and just like STIR/SHAKEN, registration alone doesn't stop filtering if the content or behavior looks bad. We cover that in why approved campaigns still get filtered and in what carriers actually check under 10DLC.
Worked example: what attestation and labels do to your cost per connect
Answer rate is where caller ID verification turns into money. Here is an example using the Ready Dialer, which is billed at $0.025/min, with each started minute billed as a full minute, no seat plans, and every minute billed at that one rate.
Assumptions (this is an example, not measured Ready data):
- 200 outbound calls a week to leads who filled out a form
- A call that rings out unanswered bills nothing: the Ready Dialer bills answered time only
- Connected calls average 4 minutes
- Scenario 1: the number carries a spam label, assumed 20% answer rate
- Scenario 2: the number has a clean reputation and verified caller ID, assumed 30% answer rate
Scenario 1 (20% answer):
- 40 connects × 4 min × $0.025 = $9.60
- 160 misses: $0
- Total: $4.00, or $0.10 per connect
Scenario 2 (30% answer):
- 60 connects × 4 min × $0.025 = $14.40
- 140 misses: $0
- Total: $6.00, or $0.10 per connect
The cost per connect is the same. The real gap is 20 extra conversations a week from the same list, the same hours and the same rep. If even a small share of those turn into booked jobs or sales, that is worth far more than the per-minute cost. This is why business callers care about the checkmark and the label. Minutes are cheap. Unanswered calls to leads you paid to acquire are not.
For a broader look at what calling software costs, see auto dialer pricing.
Pairing a text with the call
You can't control how a recipient's phone renders your caller ID. You can control whether your number is a stranger when it rings. Sending a short text first is the simplest way to do that.
On Ready, the pattern looks like this:
- A lead fills out your form. They have given consent to be contacted.
- A text goes out right away from the same number you'll call from: "Hi Dana, it's Sam from Brightline Roofing. Got your request, I'll call in a few minutes from this number."
- A rep clicks to call from the dial pad in the Ready dashboard or inside GoHighLevel.
- If the lead calls back while the rep is busy, inbound calls ring the open pad. A missed call can text the caller back so nobody slips through.
That text is 105 characters of plain GSM-7, so it fits in one segment and costs $0.0075/segment plus a $0.0045 carrier fee. Texting needs its own A2P 10DLC registration. There is no setup fee: the charge at submit is the first month, $25, then $25/mo for registration + $2 per number. Most approvals take 2 to 7 days. The first 20 texts are free one-to-one sends, so use them before you register. If you're new to registration, start with what 10DLC is.
To be clear about what the Ready Dialer is: a click-to-call tool for people making calls, with consented call recording and transcripts, inbound calls and a Missed call card in the Inbox thread for each missed call. It doesn't auto-dial, drop voicemails or transfer calls. If you need high-volume automated calling, a different kind of tool fits better, and that kind of calling is also what tends to damage a number's reputation.
What you can and can't control
You control:
- Calling from numbers your provider assigns to you (better odds of A attestation)
- Who you call (consented, expecting leads)
- How fast and how often you call
- Whether a text introduces your number first
- Registering your business name with carrier and analytics portals
You don't control:
- Whether the recipient's phone or carrier displays a checkmark at all
- Signatures lost on legacy network legs
- How a given analytics engine weighs your call patterns on a given day
So treat a checkmark as a floor, not a finish line. Good attestation keeps your calls from looking spoofed. Good behavior keeps them from looking like spam.
The practical takeaway
STIR/SHAKEN proves your caller ID is real. A attestation, which you get by calling from numbers your provider controls, gives you the best chance at a checkmark. Spam labels come from a separate reputation system that watches how you call, so pace your calls, call people who expect you, and introduce your number with a text first. If you want to try calling and texting from the same number in one inbox, you can sign up and check the per-minute and per-segment rates on our pricing card.
FAQ
What does a checkmark next to a call mean?
It means the caller's carrier signed the call under STIR/SHAKEN and the receiving carrier verified the signature, so the number shown is genuine and not spoofed. It does not confirm the caller is trustworthy or that the call is wanted.
Can a verified call still be spam?
Yes. Verification only authenticates the number. Spam labels come from call-analytics systems that score behavior such as call volume, very short calls and blocks. A fully attested number can still be labeled if it calls like a robocaller.
What is the difference between A, B and C attestation?
A means the provider knows the caller and confirmed they're authorized to use the number. B means the provider knows the caller but can't confirm the number. C means the call came through a gateway and the provider can't vouch for its origin. Only A reliably leads to a verified display.
Why don't my business calls show as verified?
Common reasons are displaying a number your calling provider doesn't own (which limits you to B attestation), the call crossing a non-IP network leg that strips the signature, or the recipient's carrier or phone not showing a checkmark at all. Ask your provider what attestation your calls receive.
Does STIR/SHAKEN apply to text messages?
No. STIR/SHAKEN covers voice calls. Business texting has its own trust system, A2P 10DLC registration, where carriers verify your brand and campaign before your texts flow on registered routes. Most approvals take 2 to 7 days.