CNAM: How to Set Your Business Caller ID Name

CNAM (Caller ID Name) is the business name that appears alongside your number when you call someone. In the US the name is not sent with the call: the person's carrier looks it up in a CNAM database, using your number, and decides whether to display it. Names are limited to 15 characters.

A clear CNAM helps people recognize your calls. It does not guarantee your name will show, especially on cellphones, and it is separate from spam labels and STIR/SHAKEN.

How CNAM works in the US

According to Talkdesk's documentation of US and Canadian CNAM:

1. Registration. Your phone provider submits your business name, up to 15 characters, for CNAM registration through its carrier partners.
2. The dip. When you call someone, their carrier (the terminating carrier) receives your number and may look it up ("dip") in a CNAM database.
3. Display. If the lookup returns a valid record, the carrier may display your name.

There is no single official CNAM database in the US. Carriers use different third-party databases, and some use cached or periodically synchronized copies rather than looking up every call.

Canada is different

Talkdesk notes that many Canadian carriers support name delivery through SIP signaling, where the originating carrier includes the name with the call itself. Support varies by carrier and call path, so name display on calls to Canada is not guaranteed either.

The rules for a CNAM name

Rule	Detail
Length	15 characters maximum, including spaces
Case	Usually displayed in capital letters
Characters	Letters, numbers and spaces; special characters are generally not allowed
Content	Must reflect your actual business or individual name

Fitting your name into 15 characters

Full name	15-character options
Rodriguez Family Dental Care	RODRIGUEZ DDS, RODRIGUEZ DENTL
Northside Heating and Air	NORTHSIDE HVAC, NORTHSIDE HEAT
Green Valley Landscaping LLC	GREEN VALLEY, GREEN VALLEY LS
The Law Office of Sarah Kim	SARAH KIM LAW, KIM LAW OFFICE

Tips:

• Lead with the word customers know you by.
• Drop "LLC," "Inc." and "The."
• Use common abbreviations customers will recognize.
• Avoid generic words that could belong to anyone, such as "INFO" or "SERVICE."
• Use the same name on every number you call from.

Brand name or person's name?

Most businesses register the brand. Some, such as solo professionals, real estate agents and consultants, are better known by a person's name. Pick whichever the people you call will recognize on a small screen in under a second. A few practical cases:

• One brand, several numbers: use the same CNAM on all of them so customers learn it.
• Several brands under one company: register each number with the brand customers know it by, not the parent company's legal name.
• A new number that used to belong to someone else: expect the old name to linger in some databases for a while after you register yours, and recheck in a few weeks.
• Staff calling from personal cellphones: their personal carrier's caller ID applies, not your business CNAM. Calling through your business phone system keeps the business number and name consistent.

Why your name may not show

Talkdesk lists the main limitations, which apply to any provider:

The receiving carrier controls display

No provider can force a customer's phone to show your name. The receiving carrier decides whether to perform the lookup. Some carriers charge their subscribers for caller name, and if the subscriber has not enabled it, they see only your number. Even with a valid record, a carrier may display its own caller identification data instead.

Mobile phones use other sources

CNAM was designed for landlines. Many mobile carriers supplement or replace it with their own caller identification services or third-party platforms such as Hiya, Truecaller or Google. The name a cellphone shows may come from those sources rather than your CNAM registration.

Outdated databases

Because carriers use different and sometimes cached databases, a carrier may show an old name previously associated with your number. Talkdesk notes it can take weeks for a new CNAM to propagate across all carrier databases. If you recently got a number that used to belong to someone else, the old name may linger for a while.

Contacts override CNAM

If the person you are calling has saved your number in their contacts, their phone shows the contact name, not CNAM.

CNAM, spam labels and STIR/SHAKEN

These are three different systems that all affect how your call appears.

System	What it does	Who controls it
CNAM	Shows a text name for your number	Your provider registers it; the receiving carrier chooses to display it
STIR/SHAKEN	Authenticates that your caller ID is not spoofed	Your provider signs; the receiving carrier verifies
Call analytics	Labels calls "Spam Likely" or similar	Analytics providers working with carriers

A good CNAM will not remove a spam label, and a spam label can replace your name on screen. If your calls are labeled, see why business calls show Spam Likely. For authentication, see STIR/SHAKEN explained.

How to check your CNAM

1. Call a landline. Landline carriers are more likely to perform CNAM lookups. Call a friend's or another office's landline and see what appears.
2. Call several mobile carriers. Ask colleagues on different carriers what they see. Expect variation.
3. Ask your provider. Confirm the exact name registered on each number.
4. Recheck after changes. After changing your name or porting numbers, check again over the following weeks.

Toll-free numbers and CNAM

Talkdesk notes that toll-free numbers use a separate CNAM registration process from local numbers, that support for toll-free CNAM varies by carrier, and that some carriers may display only the number or a generic label instead of the registered name. If a recognizable name on outbound calls matters to you, a local number with a registered caller ID name is usually the better choice for outbound calling. See local vs toll-free numbers for the broader trade-offs.

Setting up CNAM: checklist

• Choose a 15-character name customers will recognize
• Confirm your provider has registered it on every outbound number
• Use the same name on all numbers
• Test on a landline and on several mobile carriers
• Register your numbers with the analytics providers' free caller registry
• Recheck after porting a number or changing your business name
• Do not display numbers you do not control

Caller ID name on Callata

When you add a number in Callata, Callata registers its caller ID name from your business name, using letters, numbers and spaces up to 15 characters. Calls your team places show your business number, and Callata's terms prohibit spoofing caller ID. As with any provider, whether a recipient sees the name depends on their carrier, so test on a few phones. If your full business name does not fit well in 15 characters, contact [email protected]. Callata is $99 a month for up to five users, with up to three local numbers included; additional users are $20 a month. Get started.