Fixed and non-fixed VoIP are both internet-based phone services, but the difference between the two comes down to a physical address. A fixed VoIP number is tied to a verifiable physical address, which makes it more reliable and traceable. A non-fixed VoIP number isn’t tied to any address and can be set up anonymously, which makes it riskier for fraud. Trestle reports the two as distinct line types.
What is the difference between fixed VoIP and non-fixed VoIP, and why do we differentiate between the two? We get this question often. Many competitors will just have a linetype of VoIP and will not differentiate between the two, but at Trestle, we do. Let’s start with the basics.
Voice over Internet Protocol (VoIP) technology has become an integral part of modern communication. Within this domain, there are two primary types of VoIP phones: fixed and non-fixed. Distinguishing between them not only helps in understanding their operation but also plays a pivotal role in fraud detection and prevention.
What is a Fixed VoIP? #
Fixed VoIP phones are associated with a specific physical address. Registering for this service necessitates providing a verifiable physical address. Trestle tracks 110+ fixed VoIP carries today.
Why Choose a Fixed VoIP? #
Advantages: #
- Reliability: Tends to offer more consistent connection quality.
- Emergency Services Integration: Can provide exact location details in case of emergencies.
- Quality: Often boasts higher voice clarity with fewer disruptions.
- Verification Process: Stringent checks often applied by service providers reduce potential misuse.
Disadvantages: #
- Mobility: Limited to a specific location, making it less versatile for frequent travelers.
What is a Non-fixed VoIP Phone? #
Non-fixed VoIP phones aren’t tied to any given physical address. They can be procured without presenting an address. Trestle tracks 750+ non-fixed VoIP carriers today.
Advantages: #
- Portability: Suitable for users on the move, offering the ability to use the number anywhere with an internet connection.
- Easy Set-Up: Minimal verification leads to quicker setup processes.
- Cost-Efficiency: Typically more affordable, especially for international communication.
Disadvantages: #
- Emergency Services Integration: Difficulties in pinpointing exact caller location.
- Potential for Misuse/Abuse: Increased risk due to easy accessibility and anonymity.
- Anonymity: The absence of a fixed address offers users anonymity, potentially making these numbers attractive for misuse.
- Ease of Acquisition: With lax verification, malicious entities might obtain and discard these numbers frequently, complicating trace efforts.
Fixed vs. Non-fixed VoIP: Quick Comparison #
| Attribute | Fixed VoIP | Non-fixed VoIP |
| Tied to a physical address? | Yes, requires a verifiable address. | No address required. |
| Setup and verification | More involved. Depending on the provider from which the line was purchased, includes registering the physical address, connecting the hardware, and verifying the connection via test call. | Less involved. Select a provider, choose a phone number, and download an app. |
| Reliability and call quality | More consistent | Varies |
| Emergency services location | Accurate location available | Hard to pinpoint |
| Cost | Higher | Lower |
| Fraud/abuse risk | Lower | Higher |
| Carriers Trestle tracks | 110+ | 750+ |
Why the Difference Matters for Businesses #
Misuse/Abuse Prevention #
Recognizing the nature of a VoIP number allows businesses to apply relevant abuse detection techniques. For instance, a sudden spike in traffic from a non-fixed VoIP might be treated with more suspicion than from a fixed one.
Avoiding False Positives #
Proper identification between these two types ensures that genuine users, especially on fixed VoIP lines, aren’t wrongfully flagged for regular activities, ensuring seamless service.
Tailored Security Protocols #
Differentiation helps in applying security measures suited to the nature of the VoIP. For instance, non-fixed VoIP numbers might undergo more frequent behavioral analysis or additional 2FA (2-factor authentication checks).
Improved Customer Trust #
By effectively identifying and minimizing fraud, service providers enhance their reputation, instilling greater trust in their user base.
How to Identify Fixed vs. Non-fixed VoIP Numbers #
The only reliable way to tell whether a number is fixed or non-fixed VoIP is to check its line type. Most phone validation APIs return the line type for a phone number, but few differentiate between fixed- and non-fixed VoIP.
Trestle returns fixed VoIP and non-fixed VoIP as distinct values rather than lumping them under a single “VoIP” label. For more on why this distinction matters, see Why is Line Type Intelligence Important? and Line Type Fidelity and Confidence.
Want to flag non-fixed VoIP numbers automatically? Try Phone Validation API and identify line type in real time, so you can route or reject leads with confidence. Start a free trial today, no credit card required.
To conclude, the distinction between fixed and non-fixed VoIP extends beyond their operational characteristics. For businesses, this differentiation is pivotal in crafting effective fraud detection strategies, ensuring consistent service quality, and fostering trust among their clientele. This is why we recommend businesses check the line type. If the phone is non-fixed VoIP, we suggest appropriately adjusting the workflow to de-prioritize or reject those leads.
Frequently Asked Questions #
What does fixed VoIP mean?
Fixed VoIP means an internet-based phone number that’s registered to a verifiable physical address. Because it’s tied to a real location, it behaves more like a traditional landline, is more reliable, and associated with emergency services.
What does non-fixed VoIP mean?
Non-fixed VoIP refers to an internet-based phone number that isn’t tied to any physical address. These numbers can be created quickly with little verification, which makes them flexible for legitimate users but also more attractive for fraud.
What is the difference between a fixed VoIP and non-fixed VoIP number?
The core difference is the physical address. A fixed VoIP number requires a verifiable address, while a non-fixed VoIP number doesn’t. That single distinction drives the differences in reliability, emergency-services support, cost, and fraud risk summarized in the comparison table above.
Is non-fixed VoIP the same as non-VoIP?
No. Non-fixed VoIP is a type of VoIP number; it just isn’t registered to an address. “Non-VoIP” usually refers to a traditional landline or mobile number that doesn’t use VoIP at all. They’re different line types and shouldn’t be confused.
How do you identify a non-fixed VoIP number?
Check the line type. A phone validation or reverse phone API can return whether a number is fixed VoIP, non-fixed VoIP, mobile, or landline. Trestle reports non-fixed VoIP as its own line type, so you can flag these numbers automatically instead of treating all VoIP the same.
Are services like Zoom Phone fixed or non-fixed VoIP?
It depends on how the number is provisioned. The same provider can offer both. A number registered to a verified address may classify as fixed VoIP, while a number set up without an address may classify as non-fixed VoIP. Checking the line type is the only reliable way to know.