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SIP Trunks provider in the UK

Reliable connectivity for your onsite phone system

Connect your VoIP compatible onsite phone system and save on line rentals and calls. We can also interconnect hosted mPBX with your onsite system, provide 03/0800 numbers via SIP trunk and offer inbound numbers from other countries.
View rates & plans

UK map UK based service infrastructure
Up & down arrows Inbound and outbound
caller ID support
Handshake Risk free
14 day trial
Headphones Support for SIP protocol
Number porting Number porting. Port your numbers in or out.
Bill Prepaid and postpaid billing models
Gears Assistance with configuration of your PBX
Gears G.711 (alaw or ulaw), G.729, G.722 codecs

SIP trunk rates & plans

SIP Trunk with
Unlimited* calls to majority of UK numbers
per channel /
per month   £49.99 inc VAT GBP
  • Including UK Landline (01, 02, 03, 056); UK Mobile (O2, 3, Vodafone, EE, Orange) and UK 0800, 0808 numbers
  • Bonus offer:
    Free unlimited* calls to 50+ countries >
SIP Trunk with
Low monthly fee
and rated calls
per channel /
per month   99p inc VAT GBP
  • Guaranteed high quality caller ID enabled routes

Call plans listed here are designed for general business use. Calls to 0800 or 0808 are free; Calls to UK-wide 03 geographic numbers are rated at the same rate as calls to any other geographical number.

Call Plans

inc VAT
UK landlines (01, 02, 03, 056) Rated per second. 1p min charge.
UK mobiles (O2, 3, Voda, EE, Orange) Rated per second. 1p min charge.
UK 0800, 0808
Minimum monthly spend to UK destinations
SIP TRUNK Basic Business
1p p/min
4.75p p/min
0p p/min
SIP TRUNK 25 Business
0.95p p/min
3.6p p/min
0p p/min
SIP TRUNK 100 Business
0.90p p/min
2.9p p/min
0p p/min
SIP TRUNK 250 Business
0.85p p/min
1.9p p/min
0p p/min

High call volumes?

We love competing! Please have a look at our special rates for call centres
or give us a call, tell us about your call volumes and we will provide you with unbeatable offer

SIP Trunks for call centres Contact us
SIP Trunk Critical Information Summary

International Call Rates – click here; Any unused call credit will rollover to the next billing cycle. In order to use the rollover value, account must have positive balance. Change of call plan will result in loss of unused rollover value. Published rates are per minute but billed per second. 1p minimum call charge apply. Call charges are rounded up to three decimal places.
Prices are in GBP inc. VAT.

Advanced functionality

SIP trunk service is part of our mPBX system. This enables some unique features to be configured that are not normally available for SIP trunk services.
Integration between onsite and Hosted PBX systems
Automated failover in the event of internet outages

SIP trunk object within mPBX can be configured in two different modes:

Diversion to SIP URI
This mode is useful if you want to send a call to the specified SIP address. SIP URI must be in the following format:
example: or 443333051330@
Create SIP registration
Register your SIP Server with us (e.g. connect your PBX to us).
Enjoy low VoIP rates and complete integration between your onsite and hosted mPBX systems.
Your PBX will be able to call users on our system or dial out to the world and mPBX users will be able to call extensions on your PBX.

Get your FREE account today and try it for yourself

SLA Guaranteed uptime of 99.9% for your mission critical business phone system

Find out why our
customers like us
Current Service Status
Independently monitored by, one of the leading independent network monitoring services with advanced reporting & notification systems.

We also offer the following services to cover your most demanding requirements

Freephone/UK-wide services

Freephone/UK-wide numbers

Visit Freephone/UK-wide services page

Professional image
does not have be expensive.
Get a number for your business today.

International inbound phone numbers

International inbound phone numbers

View more info Download PDF

Connect phone numbers from over 50 countries around the world. Make it easier for your overseas customers to reach you.

Voice Artist

Voice Artist

View more info Download PDF

Impress your clients with
professionally recorded greetings.

Number Porting

Number Porting

View more info Download PDF

Number porting supported.
Keep your existing phone number wherever you go.

SIP trunking

Frequently asked questions

  • Do I need internet and how fast?
    VoIP (Voice over IP) requires data connection between your premises and our servers. In most cases it would be public internet. However you only need tiny amount of bandwidth – connection speed in order to use VoIP. Each channel requires 80Kbps (that is 0.08 Mbps), or using compressed codec even smaller – 0.03Mbps. Quality of VoIP will highly depend on reliability of your internet connection. It does not have to be very fast, but it must be reliable and stable. We also recommend using dedicated internet link for setups with over 5 phones.
  • What happens if my internet goes down?
    We have multiple solutions that can make sure you can continue to receive calls even when your internet goes down. You can have calls diverted to your mobile phone if you are offline, this way you can continue to receive calls without any internet. You can also have multiple internet connections for redundancy so if one connection fails you can continue to use the other.
  • What is the quality like?
    Simply speaking – it is better than using traditional phone lines. We use G722 (High Definition Voice Codec). Connection will be crystal clear and better compared to normal PSTN services. Also, unlike many other services, all our equipment is hosted locally, meaning that there will be no delays in voice transmission.
  • Is it reliable?
    Our systems are optimized for reliability, not price. We guarantee 99.9% SLA backed uptime on all our systems. All parts of the system are fully redundant, meaning that there is no single point of failure. This is not just words. We use independent monitoring company called to monitor our server uptime. Hyperspin monitoring results published here.
  • Why is there a minimum monthly spend?
    We offer lower rates for larger call volume accounts. For services with minimum monthly spend we deduct the minimum monthly spend ammount on the 1st of each month and this ammount becomes call credit on your account. There are no extra charges for calls up to the minimum monthly spend, calls over are charged at the call plan rates.
  • Do you have references?
    We have client testimonials on our testimonials page.
  • Where are you based?
    Our head office is in London, United Kingdom with our servers located in Reading, Berkshire datacentre. All sales and support is handled by our highly trained staff.
  • Can i port my number in or out?
    Almost all UK telephone numbers can be ported into our system. Any UK numbers that we provide or are ported into our service can be ported to another provider as long as that provider is willing to take on the number.
Let's talk
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Have special requirements?
Let us tailor a solution to suit your needs

We will be happy to give you a call and go though the list of your requirements. Once we understand your needs, we will provide you with detailed quotation. We can also create custom call plans, integrate with third party systems and customise the setup to create custom solution based on your requirements

Or sign up to start your
Hosted PBX 14 day free trial today!