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If you're looking for an office phone system for your business, the choice of systems can be a bit daunting. There's no shortage of options to choose from and with plenty of technical jargon chucked into the mix, you'd be forgiven for seeking help. In this post, we review the best office phone systems currently available and explain some things to look out for when comparing them. If you need assistance in choosing the best business phone system, please request a comparison quote, and our experts will show you which is the right for your business.
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In recent years, there's been a seismic shift in how business phone systems work, which affects both small businesses and large. The introduction of VoIP, which is phone calls made over the internet, has completely changed the way businesses communicate.
Gone are the days of needing expensive physical telephone lines and digital telephone systems. With VoIP, everything is done over the internet.
As we'll explain, there are many benefits associated with VoIP, but perhaps most importantly, it's far cheaper than older technologies. For a low-cost monthly subscription, your business can now get all the office phone system features big companies have been using for years.
Far from just giving your business a reduction in costs, a VoIP office phone system will open up all kinds of possibilities for your company's communications. This section summarises some of the key benefits you can expect from VoIP phone systems.
Implementing a VoIP-based office phone system gives you and your team the freedom to work from anywhere, as long as you have a stable internet connection. Firstly, you can plug your desk phone into any internet connection to make calls, so if you suddenly need to have your entire workforce work from home, you can. Not only that, but you can also make and receive phone calls on your desktop computer and mobile devices. This functionality is helpful in any business where people spend time away from the office. You could be attending a conference in London when a call comes on your desk phone, and it'll simultaneously ring your mobile. From the caller's perspective, you're in the office, they've rung a landline number after all, but little do they know, with your VoIP phone system, your not.
If you're used to having a small business phone system that relies on ISDN telephone lines or PSTN, you likely won't be used to having a significant number of features.
Let us draw your attention to some of the best you can expect from VoIP based office phone systems.
As we've already outlined, you'll save money by using an office phone system that runs on VoIP, plus you'll get tons of additional benefits. In addition to those, you'll also get the safety of knowing that you've future-proofed your business and have in place the latest technology.
You may or may not be aware that in 2025 BT will be turning off its ISDN and PSTN telephone networks, which means everyone, be that consumers or businesses, will need to switch to VoIP.
The other thing to add to this benefit is that VoIP phone systems are incredibly scalable, so it's doubtful you'll outgrow the system you choose. You could be a small business now with only a few handsets and then experience colossal success and grow to thousands and still keep the same VoIP system.
So long as you have a stable internet connection and good VoIP phones, you'll experience high-definition calls with no crackling, fuzziness or distortion. At T2k, we typically recommend that you have a separate internet connection for your VoIP phones in your office to avoid your general web browsing affecting call quality. You don't have to do this, but you can ensure the best performance from your phone system for the relatively small additional investment.
At T2k, we regularly review all of the leading phone systems on the market to be best informed when speaking to customers. We're vendor agnostic, meaning we don't prefer one over another; we always recommend the best one for the business we're talking to.
With so many office phone systems to choose from, it's always wise to request a comparison quote from us. We will do the leg work for you and come back to you with summarised recommendations based on your requirements.
In this part of our guide, we will distinguish between telephone systems that are best for small vs larger businesses. As you'll note, some systems appear in both lists as they're suitable for companies of all sizes.
Currently, we recommend these five small business phone systems, each with its use-cases and applications.
If you're here looking for a business telephone system and need some assistance choosing the best for you, please request a comparison quote, and one of our experts will be in touch.
| Image | Office Phone System | Rating | Price |
|---|---|---|---|
Top-rated phone system  | Gamma Horizon Best for: Most Small Businesses Gamma Horizon is a cloud-based telephone system, meaning that the only equipment you have in your office is desk phones. All call processing takes place remotely, and you're subscribing to a service rather than buying anything. The great thing with Gamma Horizon is that it's been continually invested in and today represents one of the best office phone systems for small businesses. Benefits:
Disadvantages: - Not as flexible as other office phone systems
| 9.7 | Compare Phone Systems |
Most flexible  | 3CX Best for: Growing Businesses 3CX is different from some of the other VoIP phone systems we recommend as it isn't a fully-managed cloud-based system. Instead, with 3CX, you purchase licenses and then can choose where it is installed. However, it's not a physical phone system; it's a software-based one. It can be installed almost anywhere and likely on the equipment you already have. With 3CX, you can host the phone system in your office, the cloud or even your home if you want to. 3CX is the most flexible phone system on this list of best business phone systems and is often the least expensive. The only downside with 3CX is that it isn't as easy as others to get set up and generally requires a telecom expert's assistance. Benefits:
Disadvantages: - Not as simple as others to set up | 9.5 | Compare Phone Systems |
Landline Replacement  | Phoneline+ Best for: up to 3 lines Phoneline+ is a small business phone system aimed at companies with less than three users. We're talking primarily about retailers or sole traders that need a landline replacement service. The best thing about Phoneline+ is that is it so simple to set up and use, making it extremely attractive for those who don't need all the bells and whistles of some of the other systems we've outlined. Phoneline+ gives small businesses an easy transition to VoIP, and for companies that know they won't need more than a few handsets is perfect. The only significant downside of Phoneline+ is the lack of scalability, meaning if you do grow and need more phones, you'll need to switch to a new office phone system. Benefits:
Disadvantages: - Not a scalable business phone system - you can only have a few phone lines | 9 | Compare Phone Systems |
 | beOnline bOnline is an award-winning VoIP provider that focuses on phone systems for smaller businesses. Aimed at start-ups, freelancers and small businesses, their cloud-based system does most of what a growing company might need. They've built an excellent reputation for providing a small business phone system that doesn't overcomplicate things but is still extremely powerful. That's all backed up with UK-based support, which is excellent based on their customer reviews. Benefits:
Disadvantages: - Less handset choice | 8.8 | Compare Phone Systems |
Ok, that's our rundown of the best business phone systems for small businesses; we hope it helps you in your decision-making process. Given their importance when it comes to your business phones, it's vital that you spend a bit of time reviewing the best phone systems to find the right one for your company. As we say, if you need help deciding, please get in touch.
As we mentioned before, some of those we recommended to small businesses are just as suitable and beneficial to larger firms, albeit with differing benefits. If you are a large company looking for a new business phone system, please get in touch to discuss your requirements; our team of experts can quickly help you identify the best solution for your business.
| Image | Office Phone System | Rating | Price |
|---|---|---|---|
Best Price & Features | 3CX Best for: Most Large Businesses While we believe that Gamma Horizon is the best choice of cloud-based systems for small businesses, we think it's 3CX that's leading the pack when it comes to larger companies. It's pretty much unrivalled, and it's for that reason that many companies are opting for this PBX phone system over others in the market. We say this because, with 3CX, you get so many features and benefits at such a low cost. For larger companies with presences across multiple sites, you can have numerous 3CX instances, meaning there's almost no limit on the number of users it can support. Not only that, but the call management functionality is second-to-none, and you and your team will enjoy a significant improvement in your business communications. The only downside is that you'll need your SIP trunks to run a 3CX phone system, but they are quickly produced. Finally, there is tons of built-in functionality for those running call centres that'll improve efficiency and performance. Benefits:
Disadvantages: - Requires more management than other office phone systems | 9.8 | Compare Phone Systems |
Fully Managed Service | Gamma Horizon Best for: Businesses looking for a fully managed service Gamma Horizon is just as good for larger businesses as smaller ones. However, 3CX will always come out on top from a cost perspective. That doesn't mean you should discount this business phone system, but you should be aware that it will likely cost more in the long run. The attractiveness of Gamma Horizon as a business phone system to companies of all sizes is that as far as a VoIP system goes, it does almost everything. If you're looking for reliability from your phone system (which you should be), Gamma Horizon is a top choice. It's a mature platform built on an entirely UK based network, and with hundreds of thousands of users, it's tried and tested too. If you're looking for an easy option and are happy to pay a bit more on your business phone system, then Gamma Horizon could be the best option for your business. Benefits:
Disadvantages: - More expensive in the long run compared to 3CX
| 9.2 | Compare Phone Systems |
Global Unified Communications  | RingCentral Best for: Global Companies RingCentral is a global Unified Communications provider with a powerful proposition for larger companies looking at a new phone system. They are right up there with the best office phone systems in terms of features and functionality. However, their biggest downfall is the levels of customer service they provide. We're here to rate phone systems, not providers, and RingCentral's phone system is undoubtedly among the best currently available. Benefits:
Disadvantages: - It can be expensive to access all the features | 8.9 | Compare Phone Systems |
We hope that this article goes some way to help you in finding the best office phone system for your business. As we've said a few times, the right phone system for your business will likely be different from the next, so please request a comparison quote to find out which fits your requirements.
T2k is an independent business telecoms specialist based in Bournemouth. Having provided services to businesses for over 25 years, T2k has established itself as the go-to adviser for companies across the UK in various sectors. We take pride in our approach and treat people as we like to be treated, meaning there's never any pressure selling; we always put you and your company first.
Having worked for T2k for nearly 25 years, it's fair to say that Lee is an expert when it comes to all things telephony and business communications. Overseeing the commercial side of the business, he has helped the company evolve and grow through the decades. In recent years, and with the advent of VoIP and hosted telephony, Lee has made sure that T2k is at the forefront of technological developments. With a firm interest in helping businesses navigate the world of telecoms, Lee is responsible for the majority of the content on this website.
