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These days, many businesses are transitioning away from traditional telephone lines to Voice Over Internet Protocol (VoIP) phone systems to enhance communication capabilities and efficiency. Central to this shift is the VoIP phone number, which typically falls into two categories: fixed or non-fixed.
Non-VoIP numbers, assigned to traditional telephone lines, exist alongside fixed and non-fixed VoIP numbers, each offering distinct advantages for connectivity, flexibility, and security. Your choice can impact your local presence, communication infrastructure, and cost efficiency. Understanding the differences between these phone number types is important because it ultimately affects how you connect with customers, manage operations, and position yourself in competitive markets.
Not all phone number types are the same, and there are distinct differences between non-VoIP, fixed VoIP, and non-fixed VoIP numbers.
A fixed VoIP number is a Voice over Internet Protocol (VoIP) phone number tied to a specific physical address. Although it utilizes the internet to connect calls, it's associated with a particular location, such as a business office or home, similar to a traditional landline.
A non-VoIP or traditional phone number refers to a standard landline phone number that uses physical copper wires to make calls, as opposed to a VoIP number, which utilizes the internet to connect calls. It is tied to a specific geographical location and requires a physical address to work.
A VOIP number that is non-fixed is a virtual phone number that is not tied to a physical phone line or address.
The main difference between a non-fixed and fixed VOIP is that the fixed is linked to a certain physical address, meaning it's geographically tied to a location, while a non-fixed number is not associated with a particular address and can be used from anywhere. The non-fixed VoIP essentially acts as a virtual phone number that isn't bound to a single location.
The following chart outlines the key differences between fixed VoIP and non-fixed numbers:
| Feature | Fixed VoIP Number | Non-Fixed VoIP Number |
|---|---|---|
| Location | Tied to a specific physical address. Ideal for businesses that have a single location. | Not tied to any physical address. It can be used from anywhere. |
| Emergency Calls | Easier to trace by emergency services due to the associated address. | It may be harder for emergency services to trace them due to the lack of fixed locations. |
| Local Presence | Establishes a clear local presence within a specific area or region. | Can choose numbers from any specific area code, no matter your actual location. |
| Reliability | Considered more reliable for consistent call quality and traditional communication. | Call quality depends on an internet connection, but it offers flexibility for remote work. |
| Mobility | Limited to the associated location; moving requires updating the address. | Highly mobile and can be used on any device from any location. |
| Security | Generally considered more secure because of the fixed, traceable address. | It may sometimes be perceived as less secure or credible due to its flexibility. |
| Cost Efficiency | Typically higher costs are due to location-based services and regulatory fees. | Often lower cost and more affordable for global or remote teams. |
Businesses with remote workforces, international operations, call centers, or anyone who needs a phone number not tied to a specific physical location, allowing them to operate from anywhere with an internet connection, typically use a non-fixed VoIP number. This can include digital nomads, businesses with distributed teams, and companies wanting to appear local in multiple regions without a physical presence.

While many businesses have already chosen VoIP over traditional non-VoIP options, a fixed number isn't always necessary.
A fixed number offers advantages for hyper-local businesses, such as landscaping companies, home-cleaning services, or other location-based companies. These numbers, which are tied to a physical address, help establish credibility and make it easier for emergency services to trace calls if needed.
On the other hand, non-fixed VoIP numbers are ideal for businesses managing remote teams or operating without a permanent office. These businesses can still obtain phone numbers with local area codes, even if team members are spread across the country or the world, without needing a fixed location.
Some businesses choose to use both types of numbers. For example, a company might register a fixed number for its main office or headquarters to establish a stable local presence while equipping remote employees with non-fixed VoIP numbers to support flexibility and mobility.
Understanding the differences between fixed VoIP, non-fixed VoIP, and non-VoIP numbers is essential for making the right choice for your business communication needs.
There is no one-size-fits-all solution, and many businesses benefit from a hybrid approach, combining fixed and non-fixed numbers to balance local credibility with global flexibility.
Before choosing your phone number type, assess your communication needs, team structure, customer base, and long-term growth plans. This way, you'll invest in a communication system supporting your current operations and future goals.