One provider. Several proven routes.
Business calling designed around the way you work
A modern VoIP phone system carries calls over IP connectivity instead of relying on a traditional telephone line for each user. That opens up several practical ways to deliver business calling, but it does not mean every organisation should use the same platform.
I.T Communications supplies and supports several types of business VoIP phone system. We can provide a fully hosted PBX, connect a compatible existing telephone system with SIP trunks, enable external calling in Microsoft Teams, or deliver a straightforward hosted Soft-Switch PBX. The recommendation starts with your users, sites, call flows, existing equipment and plans—not a predetermined product.
What is a VoIP phone system?
VoIP means Voice over Internet Protocol. In plain English, voice calls are converted into data and carried across an IP network. The service can still use familiar UK business telephone numbers and connect calls to and from the public telephone network, while giving organisations more choice over where and how users answer.
Depending on the platform, people can make and receive calls through compatible desk phones, desktop software, mobile applications or Microsoft Teams. Extensions, company numbers and call-routing policies can be managed centrally, helping remote workers and different offices operate as one organisation.
VoIP telephone systems range from complete cloud phone systems to connectivity for an existing PBX. Some businesses want to replace on-site equipment and move the whole platform into a managed environment. Others have a capable telephone system they want to retain and only need an IP SIP trunk for inbound and outbound calls. Understanding that distinction is the first step when comparing phone systems for business.
Choose the right form of business VoIP
Each route below solves a different operational requirement. These summaries help narrow the choice; the linked specialist pages provide the product-specific detail.
Hosted 3CX
A feature-rich cloud PBX for organisations that want desk phones alongside desktop and mobile applications. It can support call routing, queues, reporting, contact-centre capabilities and users working across offices or remotely.
I.T Communications hosts the platform and provides the associated voice connectivity, telephone numbers and support, creating a joined-up service rather than separate suppliers for each layer.
Explore Hosted 3CX →SIP trunks
An IP SIP trunk connects a compatible PBX or communications platform to the public telephone network over IP. It is often the right route when an organisation wants to retain its current telephone platform and established call flows.
SIP trunking provides inbound and outbound calling, can support UK telephone numbers and number porting, and allows concurrent call capacity to be sized for the organisation. Compatibility and resilience requirements should be assessed before migration.
View SIP Trunk Services →Microsoft Teams calling
Teams calling enables suitably licensed Microsoft Teams users to make and receive external telephone calls through the familiar Teams environment. It can bring business telephone numbers, inbound calls and outbound calls into one communications interface.
This route can reduce reliance on separate desk-phone software and is particularly relevant to organisations already heavily invested in Microsoft 365. Licensing, number arrangements and voice routing still need to be designed correctly.
Explore Teams Calling →Soft-Switch PBX
A straightforward hosted business telephone system for organisations that need extensions, business numbers, call routing and applications without operating an on-site PBX.
It supports desktop and remote working and provides predictable monthly service options. It is a practical route where requirements are clear and a managed hosted platform is preferred.
View Soft-Switch PBX →Which business VoIP phone system is right for you?
The right architecture depends on what you already have and how users need to communicate. This comparison is a starting point rather than a substitute for checking platform compatibility, Microsoft licensing or detailed call-flow requirements.
| Solution | Best for | Existing PBX required? | Cloud based | Apps | Teams integration |
|---|---|---|---|---|---|
| Hosted 3CX | Feature-rich hosted calling, flexible users and more advanced call handling | No | Yes | Desktop and mobile | Available on suitable editions and configurations |
| SIP Trunks | Retaining a compatible existing PBX or communications platform | Yes, or another compatible platform | The SIP service is network based; the PBX can be on-site or hosted | Determined by the connected PBX | Determined by the connected platform |
| Microsoft Teams Calling | Organisations centred on Microsoft 365 and Teams | No traditional PBX required | Yes | Microsoft Teams apps | Native user experience, with suitable licensing and voice routing |
| Soft-Switch PBX | Straightforward managed hosted business calling | No | Yes | Desktop and remote-working options | Not the primary use case |
Not sure which option is right? Talk to our team about your current system and requirements.
Why businesses are moving to VoIP phone systems
The value of business VoIP is not a blanket promise of lower cost. Its real advantage is the ability to design calling around current working patterns and manage users, numbers and routes with greater flexibility.
- Flexible working: compatible apps and devices can give office, home and mobile users access to business calling.
- Scalable services: extensions and call capacity can be planned as teams change, subject to the selected platform and commercial terms.
- Multi-site communications: separate locations can share central call handling, numbering and policies.
- Centralised administration: many platforms allow users, routes, opening hours and destinations to be managed from one environment.
- Number management: existing eligible numbers can be ported and new UK numbers added where required.
- Business continuity options: call-routing plans can include alternative destinations, although resilience depends on the wider system and connectivity design.
- Application-based calling: users may be able to work through a computer, mobile app or Teams instead of relying only on a desk phone.
Connectivity still matters. Like other internet phone systems for business, VoIP depends on suitable network performance, security and a properly planned implementation. We consider these alongside the telephone platform rather than treating voice as an isolated purchase.
Keep your existing business telephone numbers
Changing telephone systems does not automatically mean changing the numbers customers already know. Eligible UK geographic and non-geographic numbers can generally be moved to I.T Communications through a managed number porting service. Portability depends on the number range, current provider and account information, so we check the details before an order proceeds.
Where new numbers are needed, businesses can select from our available UK business telephone numbers. A project may combine ported numbers and new numbers—for example, preserving a main published number while adding direct dial numbers for teams or locations.
Business VoIP backed by our own UK network
I.T Communications is not simply a sales layer over a single third-party hosted product. Our voice services run across infrastructure we operate in two London data centres, with our own UK SIP network, carrier interconnects and direct operational control.
That matters because a business phone service includes more than the user interface. Calls rely on number routing, SIP connectivity, carrier relationships and the operational ability to investigate the path between a customer platform and the public telephone network. Direct visibility and control help our team support that complete service.
Operating voice and network infrastructure also allows us to support more than one VoIP technology. We can connect SIP trunks to a compatible existing PBX, provide calling for Microsoft Teams, or deliver a managed hosted platform according to the requirement. Learn more about the infrastructure and operating model on our UK network page.
Why choose I.T Communications for business VoIP?
- UK-based support from a team familiar with business voice, numbering and connectivity.
- Several VoIP platforms instead of one mandatory telephone system.
- Our own UK voice and network infrastructure with direct operational visibility.
- Business telephone number supply and managed number porting.
- SIP connectivity for compatible existing systems and hosted platforms.
- Support for straightforward installations as well as more involved multi-site and remote-working requirements.
We start by understanding what must be preserved, what needs to improve and how the organisation expects to work. If new devices are required, our VoIP hardware catalogue provides current phones, headsets and accessories. For a broader view of available architectures, see our business phone systems page.
Business VoIP frequently asked questions
What is a VoIP phone system?
A VoIP phone system carries business calls over an IP network. Depending on the platform, users can make and receive calls with desk phones, computers, mobile apps or Microsoft Teams.
What is the best phone system for a business?
There is no single best system for every business. A hosted PBX may suit an organisation replacing its current platform; SIP trunks can retain a compatible PBX; and Teams calling may suit a business already centred on Microsoft 365. User needs, call handling, integrations, sites and resilience should guide the choice.
Can I keep my existing business telephone numbers?
Eligible UK geographic and non-geographic numbers can generally be ported. We check portability and the required account information before the migration proceeds.
What is the difference between a hosted VoIP system and a SIP trunk?
A hosted VoIP service provides the PBX platform as a managed service. A SIP trunk connects an existing compatible PBX or communications platform to the public telephone network over IP.
Can Microsoft Teams be used as a business phone system?
Yes. Microsoft Teams calling can provide external inbound and outbound calls using suitable Microsoft licensing and a voice connection such as Direct Routing. The design should account for numbers, emergency-call arrangements, routing and user requirements.
Do I need special phones for VoIP?
Not always. Many services support computer and mobile applications as well as compatible IP desk phones. The right mix depends on the selected platform and how each person works.
Can VoIP support remote workers and multiple offices?
Yes. A well-designed service can connect remote users and multiple sites to shared numbers, extensions and call-routing policies, subject to suitable connectivity and configuration.
Can an existing PBX use an IP SIP trunk?
Many compatible IP PBXs can use a SIP trunk. We check the platform, configuration, call capacity, number requirements and connectivity before planning a migration.
Find the right phone system for your business
Tell us about your current telephone system, the number of users and sites, the numbers you need to keep, and how people answer calls today. We will help you compare the relevant options and identify the next practical step.