By Sagar Shankaran, Founder of CallSphere
CNAM is the legacy carrier database that displays your business name on a recipient's screen. In 2026 it works for local numbers, fails for toll-free, and is being eaten by branded calling. Here is what to register, what not to bother with, and how it interacts with STIR/SHAKEN.
Key takeaways
CNAM is the original "name on the screen" system - a 1990s-era distributed database where every terminating carrier looks up your number to find a string. In 2026 it still works for local US numbers, still fails for toll-free, and is steadily being replaced by branded calling solutions from Hiya, First Orion, and TNS. For AI voice in 2026 the move is hybrid: register CNAM for the long tail, layer branded calling for Tier-1 carriers.
Calling Name (CNAM) is a 15-character ASCII string associated with a phone number in a distributed CNAM database. When a call arrives at a terminating carrier, that carrier (sometimes) issues a SS7 dip to look up the calling number's CNAM and shows the result on the recipient's caller ID. The lookup is decentralized: dozens of CNAM databases compete, propagation takes up to 5 days, and not every terminating carrier even bothers to do the lookup.
Toll-free CNAM is a known bad: US and Canada toll-free numbers cannot be assigned to standard CNAM profiles, and most terminating carriers do not perform CNAM lookups for toll-free callers. What shows up on the recipient's screen for a toll-free call is typically a generic "Toll Free" string or an internal carrier label.
Branded calling (Hiya Connect, First Orion ENGAGE, TNS Branded Caller ID) is the 2026 replacement. It bypasses the CNAM lookup entirely by injecting verified business name, logo, and call reason into the carrier's display layer at the network edge. AT&T uses Hiya, T-Mobile uses First Orion, Verizon uses TNS - so a full branded coverage program means three separate enrollments.
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flowchart TD
A[Provision DID via Twilio] --> B{Toll-free or local?}
B -->|Local| C[Submit CNAM registration]
B -->|Toll-free| D[Skip CNAM]
C --> E[Wait 5 day propagation]
D --> F[Enroll in Hiya branded calling]
E --> F
F --> G[Enroll in First Orion ENGAGE]
G --> H[Enroll in TNS Branded ID]
H --> I[All Tier-1 carriers branded]
STIR/SHAKEN attestation is independent of both CNAM and branded calling, but it is a prerequisite for verified branded display: most branded calling vendors require A-level attestation before they will surface your brand.
CallSphere registers CNAM for every local DID on Twilio across our six verticals. The CNAM string is auto-populated from the tenant's onboarding business name, truncated to 15 characters; tenants can override per-DID in the admin console. Branded calling enrollment (Hiya, First Orion, TNS) is included on Scale ($1499/mo) and available as an add-on on Growth ($499/mo). Our 90+ tool catalog includes a CNAM lookup helper that the AI agent can use to verify what name will display before placing an outbound call. STIR/SHAKEN A-attestation is automatic for numbers we provision; ported numbers retain attestation if the previous carrier was a verified RespOrg. HIPAA + SOC 2 controls cover all CNAM metadata. The 22% affiliate program credits Branded Calling add-on revenue.
/v1/Cnam API; truncate your business name to 15 characters.Is CNAM dead? For Tier-1 carriers in 2026, mostly. Branded calling solutions are eating CNAM's lunch on AT&T, T-Mobile, and Verizon. CNAM still matters for the Tier-2 and Tier-3 carriers and rural ILECs that have not adopted branded calling.
Why does my CNAM still say "Wireless Caller"? That is the terminating carrier's fallback when their CNAM dip fails or returns nothing. Verify your registration is live in at least one major CNAM database (TransUnion, Hiya, Neustar) and check a recipient on a different carrier.
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Does CNAM work for outbound AI calls? Yes. CNAM is set on the calling number; it shows on the recipient's screen regardless of who is making the call. Set it once per DID, propagate, and forget.
Can I have multiple CNAM strings per number? No. CNAM is one-to-one with the calling number. If you need multiple brands, provision multiple DIDs.
Does branded calling cost extra on CallSphere? Yes. Hiya, First Orion, and TNS each charge per-call or per-month fees that pass through. Scale plan includes basic enrollment; high-volume tenants negotiate direct.
Start a 14-day trial with CNAM included, browse pricing for branded calling on Scale, or book a demo. Partners earn 22% via the affiliate program; volume branded calling questions go to contact.
Written by
Sagar Shankaran· Founder, CallSphere
Sagar Shankaran is the founder of CallSphere, where he builds production AI voice and chat agents deployed across healthcare, hospitality, real estate, and home services. He writes about agentic AI, LLM engineering, and shipping voice agents that handle real calls in production.
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