Hosted VoIP phone system
Use a provider-hosted service when you want business extensions without maintaining your own PBX platform.
BUSINESS VOIP PHONE SYSTEMS
VoIP Phone Systems for UK Businesses
Modern business phone systems carry voice over IP networks rather than relying on a traditional PSTN voice line for every number. UKDDI combines business numbers with SIP trunking, hosted phone services and 3CX-compatible delivery so you can choose the architecture that fits your organisation.
QUICK ANSWER
What you need to know
A VoIP phone system uses IP connectivity to carry business voice calls. It can be hosted by a provider or run on a compatible PBX such as 3CX using SIP trunks. VoIP allows business numbers, users and call handling to be managed independently of traditional copper voice lines.
CHOOSING THE RIGHT OPTION
Choose the right type of business VoIP phone system
VoIP is the underlying method of carrying voice over IP. The practical decision is who runs the call-control platform and how your numbers connect to it.
SIP trunk for an existing PBX
Keep your compatible phone system and connect UK business numbers and calling through SIP.
3CX-compatible SIP delivery
Use UKDDI numbers with a compatible 3CX environment when the trunk, routing, firewall and number formats are configured correctly.
HOW IT WORKS
Business VoIP for remote and hybrid working
IP-based voice makes it easier to separate a user’s extension from a specific traditional telephone line in one building.
Keep one company number strategy
Publish consistent business numbers while users work from offices, homes or other approved locations.
Reduce reliance on personal mobile numbers
Give staff a business calling route rather than making their personal number the customer-facing identity.
Add users without adding PSTN lines
VoIP extensions and SIP capacity can be designed around users and call requirements rather than one copper line per telephone.
BUSINESS BENEFITS
Plan a reliable VoIP deployment
Voice quality depends on more than the handset. Connectivity, network design and call routing all matter.
Use stable business connectivity
Plan sufficient bandwidth, latency and resilience for the number of simultaneous calls your organisation expects.
Configure firewall and NAT correctly
SIP platforms require an appropriate network and security configuration. Avoid making unreviewed changes to firewalls just to make voice traffic pass.
Plan failover and continuity
Consider what should happen if a site, internet circuit, device or phone platform is unavailable and include alternative routes where required.
Build your UK VoIP setup around the right number
Start with live UKDDI number availability, then choose hosted voice, SIP or another supported delivery method.
RELATED UKDDI SERVICES
Continue planning your business phone service
COMMON QUESTIONS
Frequently asked questions
What is a VoIP phone system?
It is a business telephone system that carries voice using IP networks. It may be hosted by a provider or use a customer-managed compatible PBX connected by SIP trunks.
Can I keep my existing business phone number with VoIP?
Often yes, if the number is eligible for porting. Porting should be checked before a migration date is committed.
Do VoIP phones work for remote staff?
They can, where the hosted or PBX platform, connectivity and security configuration support remote users. The exact setup depends on the selected phone system.
Is VoIP the same as 3CX?
No. VoIP is the general method of carrying voice over IP. 3CX is a specific business communications platform that can use SIP trunks and VoIP endpoints.
NEXT STEP
Search business numbers
Build your UK VoIP setup around the right number
Start with live UKDDI number availability, then choose hosted voice, SIP or another supported delivery method.