Robocalls and spam labeling are major issues in today's communication landscape. Being flagged as spam leads to a decline in trust and response rates when an unidentified phone number is calling, which cut down on answer rates. Registering your phone number is a crucial step to reducing your chances of spam labeling, boosting your phone number's reputation, and ensuring your calls are correctly identified. This can be done with SHAKEN/STIR and Voice Integrity with Close.
SHAKEN/STIR and Voice Integrity do not apply to phone numbers outside of the United States. Registration is free.
SHAKEN/STIR
To combat caller ID spoofing, the telecommunications industry has developed SHAKEN/STIR.
SHAKEN/STIR uses encrypted digital signatures to transmit caller information along the call path. This includes the caller's identity and whether they can use the phone number shown as the caller ID. Fraudsters are not trusted within this framework and face near-instant traceback by regulatory bodies.
When a phone number is registered with SHAKEN/STIR, the registration helps service providers determine how to handle incoming calls with the following outcomes:
- Allow the call to ring with a “Caller Verified” label
- Mark the call as “Potential Spam”
- Send the call to voicemail
- Block the call entirely
When sales teams register for SHAKEN/STIR via Close, they can dial their leads with confidence, knowing their calls can be directly associated with their registered business.
Voice Integrity
Due to consumer complaints about unwanted calls, major wireless providers use algorithms to block and label calls. These algorithms identify factors that may indicate an unwanted call.
Providers like AT&T, Verizon, and T-Mobile offer free services that block high-risk calls. Calls identified as "Scam," "Scam Likely," "Fraud Risk," or "Potential Fraud" can be labeled as spam or are blocked altogether. Voice Integrity allows you to remediate spam labels on your phone numbers and monitor their reputation.
Voice Integrity allows customers to register their phone numbers through Close to ensure they are not mislabeled as spam.
Being registered with Voice Integrity gives major phone providers the information they need to correct spam labels on your phone numbers, which in turn reduces the risk of being mislabeled as spam in the future and increases call answer rates.
CNAM
In addition to SHAKEN/STIR and Voice Integrity registration, Close also offers CNAM (Caller ID Name) registration for U.S. phone numbers. This helps improve the chances of your outbound calls appearing with a recognizable brand name instead of showing up as "Unknown" or just a number.
What is CNAM?
CNAM stands for Caller Name and refers to the name that shows up on a recipient's caller ID when you place a call. While registering CNAM can boost trust and increase answer rates, it’s important to understand that CNAM is not a universal standard—some carriers (especially mobile ones) may not support it fully or may only display CNAM for certain users or under certain conditions. Still, adoption is improving across the U.S., and it’s worth setting up if your business makes a lot of outbound calls.
Registering for SHAKEN/STIR and Voice Integrity
To register with SHAKEN/STIR and Voice Integrity, go the US Compliance tab under Settings and Phone & Voicemail. Complete the registration for Trusted Calling.
Please reach out to our Support Team if you have any questions about registering your Organization.
If your Organization has successfully registered with A2P 10DLC, your phone numbers have already been registered with SHAKEN/STIR and Voice Integrity.
While SHAKEN/STIR should help with your connection rate, it does not make you immune from spam labeling. Registered numbers can still be flagged again if certain call patterns are detected as inconsistent with registered usage or if consumers file spam or fraud reports against you.
How to Register for CNAM
We can submit a CNAM (Caller ID Name) registration on your behalf through our telephony provider. To begin, you'll need to provide some key business details, including your legal business name, business address, and registration number. Please contact our Support Team to request CNAM registration for your organization.
If your organization is already registered with A2P 10DLC, we will already have this information on file.
CNAM Name Submission
You’ll also need to provide the Caller ID Name you'd like to register. This name must:
- Be no more than 15 ASCII characters
- Contain only letters, numbers, and standard punctuation (no special characters or emojis)
- Be clearly associated with your business name or trademark
(Submissions are subject to vetting and approval is not guaranteed)
Once we’ve received all required information, we’ll submit your CNAM request to our provider and let you know once it’s been processed.
Registering CNAM does not guarantee that your Caller ID Name will appear on all outbound calls. Carrier support for CNAM varies—especially among mobile networks—and display may depend on the recipient’s device, network settings, or installed apps.
Not sure if your Close organization is already registered for these services? Have any other questions? Please write to our Support Team and we'd be happy to help.