Caller ID & CNAM
Internal extension identification plus carrier-level outbound CNAM through Telnyx.
How Caller ID Works with On-VoIP
On-VoIP uses a two-layer caller ID system. Internal caller ID is managed on your extensions within the On-VoIP portal — this is the name and number displayed when extensions call each other inside your phone system. Outbound caller ID (CNAM) — the name and number that appears on the recipient's phone when you make external calls — is registered and managed through Telnyx, our upstream carrier.
This separation gives you clean internal identification for your team while ensuring outbound calls are properly authenticated at the carrier level.
Internal Caller ID on Extensions
Each extension in your On-VoIP system can be assigned a name and number that displays when it calls other extensions. This makes it easy for your team to identify internal calls:
- Extension name: Set a descriptive name like "Front Desk" or "John Smith" for each extension
- Extension number: The internal dial number (e.g., 101, 102) shown on internal calls
- Phone number override: Optionally display one of your account phone numbers instead of the extension number for internal calls
Internal caller ID settings are configured in the On-VoIP customer portal under your PBX extension settings.
Outbound Caller ID Through Telnyx
When you make calls to external numbers, the caller ID and CNAM (Calling Name) displayed to the recipient is registered through Telnyx. This means:
- CNAM registration: Your business name is registered at the carrier level through Telnyx so recipients see your name, not just a number
- STIR/SHAKEN authentication: Telnyx signs all outbound calls with STIR/SHAKEN attestation, verifying your caller ID is legitimate
- Carrier-level reliability: Because CNAM is registered directly with the carrier, it propagates properly across all major networks
On-VoIP handles the Telnyx CNAM registration for you as part of your service — just let us know your desired business name when you sign up or contact support to update it.
Why STIR/SHAKEN Matters
STIR/SHAKEN is an FCC-mandated framework that verifies the caller ID on VoIP calls to combat robocalling and spoofing. Because On-VoIP routes calls through Telnyx, all outbound calls are automatically STIR/SHAKEN authenticated:
- Your calls are verified: Receiving carriers can confirm your caller ID is legitimate
- Lower spam risk: Authenticated calls are far less likely to be flagged as "Spam Likely" or "Scam Likely"
- Higher answer rates: Verified calls display normally instead of being screened out
There's nothing extra to configure — STIR/SHAKEN compliance is built into every call through Telnyx.
Caller ID for Inbound Calls
On-VoIP also provides caller ID for inbound calls, showing you the caller's number and name (when available) before you answer. This works with desk phones, softphones, and mobile apps.
Combined with call recording, inbound caller ID helps your team prepare for each call before picking up.
Key Benefits
Why businesses and residential customers choose On-VoIP for caller id & cnam.
Internal Extension ID
Set names and numbers for identifying internal calls between extensions.
Carrier-Level CNAM
Outbound caller name registered through Telnyx for maximum reliability.
STIR/SHAKEN Verified
All outbound calls are authenticated to prevent spam labeling.
Higher Answer Rates
Recognized, verified calls are answered up to 4x more often.
Inbound Caller ID
See caller name and number before answering inbound calls.
Included Free
Caller ID included with every Residential and Business plan.
Related Features
VoIP Call Recording
Record inbound and outbound VoIP calls automatically with On-VoIP. Access, download, and manage call recordings from your customer portal. Included free with every Business plan.
Learn more →Auto Attendant (IVR)
Set up a professional auto attendant (IVR) with On-VoIP. Greet callers with custom menus, route calls to the right department, and never miss a call. Included with every Business plan.
Learn more →Enhanced 911 (E911) for VoIP
On-VoIP includes E911 with every plan. Your registered address is sent to 911 dispatchers automatically so emergency services know where you are.
Learn more →Frequently Asked Questions
Common questions about caller id & cnam.
How do I set my outbound caller ID name (CNAM)?
What is the caller ID setting on my extension for?
Can I use any phone number as my outbound caller ID?
Why are my calls showing as "Spam Likely"?
Can I block my caller ID?
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