What is CNAM, and how do you register a business caller name?

CNAM, short for caller ID name, is the name of up to 15 characters that US phone networks look up and show next to an incoming number. CNAM registration for a business means your phone provider stores your business name against each number you call from. The name shows only where the called network and phone display caller names, so many mobile calls still show just the number.

How a caller name reaches the phone

The name does not travel with your call. The FCC describes the process in its October 2025 notice on caller identification (FCC 25-76, paragraph 4): the network of the person you call queries CNAM databases for the subscriber name tied to your number, then passes it to the phone. The name shown is only as accurate as the database.

In practice there are 3 steps:

1. Your provider files the name. The carrier that holds your number stores your business name against it. Businesses do not manage CNAM databases directly, as First Orion notes in its guide to branded calling.
2. The called network looks it up. When you call, the terminating network queries a CNAM database for your number.
3. The phone displays it, if the phone and the person’s plan show caller names.

There is more than one CNAM database, and the record is not always clean. In the same notice (paragraph 8), the FCC says legacy CNAM databases remain the only widespread source of caller name information, and that they are reportedly not reliably accurate and open to manipulation. Commenters told the FCC that multiple CNAM databases exist and often hold conflicting data. Updates also take time to spread: Zendesk, for example, says new CNAM registrations take 1 to 2 weeks and updates 2 to 4 weeks or longer.

The 15-character limit, and what to put in it

A CNAM name holds at most 15 characters, and spaces count. Provider documentation, such as Zendesk’s, also asks for no special characters. First Orion describes the same 15-character limit for caller ID. A long legal name loses its end, so pick the 15 characters yourself.

Full business name	First 15 characters	A better CNAM name
Contoso Pharmaceuticals	Contoso Pharmac	Contoso Pharma
Fabrikam Software Inc	Fabrikam Softwa	Fabrikam
Tailspin Toys Wholesale	Tailspin Toys W	Tailspin Toys

These are made-up names. Use the name your buyers know you by, not a slogan or a department.

Two US rules apply to the name, as of October 2026:

• Telemarketers must send caller ID. Under 47 CFR 64.1601(e), anyone who engages in telemarketing must transmit caller identification information: the number and, when the telemarketer’s carrier makes it available, the name of the telemarketer. A caller may substitute the name of the seller it calls for and the seller’s customer service number, and that number must accept do-not-call requests during regular business hours.
• The name must not mislead. 47 CFR 64.1604 bars causing caller ID to show misleading or inaccurate information with intent to defraud, cause harm, or wrongfully obtain anything of value. The rules define caller identification information as the telephone number of a call or other information about where it comes from (47 CFR 64.1600(c)), which covers the name.

Check with your counsel which of your calls count as telemarketing.

Which phones show the name

Caller ID began on landlines. The FCC’s notice describes caller ID in the 1980s as a number shown on a device attached to a wireline phone, with names added later from CNAM databases. Mobiles are less consistent.

Where your call lands	What usually shows
A landline or desk phone with caller ID name	Your number and your CNAM name
A US mobile with the carrier’s caller name feature turned on	Your number and a name from the carrier’s caller name service
A US mobile without that feature	Your number only
A phone on a network that supports branded calling	A vetted name, and sometimes a logo and a call reason

Zendesk’s CNAM guide says US carriers require mobile subscribers to opt in, and that no name displays when the person has not turned on the feature or app, even if your number has a CNAM. First Orion adds that many mobile users do not subscribe to caller ID services. A saved contact or a spam label can also change what the person sees; our guide to why calls show Spam Likely covers labels.

CNAM, branded calling, and Rich Call Data

Branded calling sends caller details with the call instead of relying on a database lookup at the far end.

	CNAM	Branded calling	Rich Call Data (RCD)
Where the name comes from	A database the called network queries	The branded calling service, after it vets the business	The caller’s provider, sent with the call
What it can show	A name of up to 15 characters	A name, and on some services a logo and call reason (First Orion: up to 32 characters)	Name, logo, call reason, and more, within data limits
Checked by	No standard check of who filed the name	The service’s own vetting	STIR/SHAKEN authentication, with vetting under the ATIS RCD standard

The FCC’s notice (paragraphs 12 and 13) explains that RCD builds on STIR/SHAKEN: the caller’s provider sends the name with the call, and the terminating provider can verify it was not altered. It also notes (paragraph 19) that several companies sell branded calling, and that it is not clear how much of it uses RCD. Attestation is a separate signal; see STIR/SHAKEN attestation levels.

The FCC wants verified names to reach more phones. In FCC 25-76, adopted on 28 Oct 2025, it proposed that a terminating provider that shows a call received A-level attestation must also show verified caller identity information, and that originating providers must take reasonable measures to verify the names they send. As of October 2026, these are proposals, not rules.

Steps to register your business caller name

1. Write the name. 15 characters or fewer, spaces included, with letters, numbers, and spaces only.
2. Match it to your business. Use your legal or trading name, the same one your provider verified.
3. File it for every outbound number, including each new local number you add.
4. Allow time. Plan for weeks, not hours, before every network shows the new name.
5. Check it. Call a landline and mobiles on 2 or 3 carriers. Expect some mobiles to show the number only.
6. Treat spam labels as a separate job. Registering numbers with call analytics providers is a different step: the Free Caller Registry says its registration data is not used to deliver caller ID name. See how to check if a number is flagged as spam.

How DialSavvy handles this

DialSavvy is your carrier. On US local numbers, we register your caller name (CNAM) from the business details you verify once, along with your business profile, SHAKEN/STIR, and caller-ID registrations with carrier analytics. The name shows on phones and networks that display caller names, so not on every call. Registrations run in the background and never hold up dialing. See managed telephony and local caller ID.

Before you file, write your 15-character name, count the spaces, and test it on a landline and 2 mobiles. To set up numbers and caller ID with us, book a demo.