Best SIP Trunking Service Providers UK

As a Leading SIP trunk provider in the UK with over a decade of experience in the industry, Xinix offers an affordable, reliable, and high-quality SIP trunk service.
With the help of SIP trunking, you will be able to operate your on-site IP PBX system from anywhere at any time.

Checkout Xinix SIP Trunking Pricing


Free Unlimited Channels
Unlimited Concurrent Calls
UK Mobile 5p Landline 1p
No Contract

£ Free
per month


3000 Minutes per Channel (2000 UK landline minutes and 1000 UK mobile minutes)
99.999% Uptime Guaranteed
Call Quality Guaranteed

£ 7
per month


One channel included

Choose from 3 Packages

Europe, Americas
60 Countries+

per month

Call for a free consultation with our phone system specialist.

03333 055 888
Anytime between 9:00AM - 5:30PM
Monday to Friday

...or send us your contact details and a specialist will get in touch.

    Xinix or its representatives will call or email you as requested to discuss your interest. Your data will be treated in accordance with our Privacy Policy which also sets out the rights you have in respect of your data.

    Awards and Feedbacks

    xinix awards

    Popular Destinations

    Tariffs are indicated in £/min

    Hong Kong
    United Kingdom

    Product options

    International Numbers

    international number
    From £5
    /month (+VAT)

    UK Numbers

    UK Numbers
    From £2
    /month (+VAT)

    CRM Integrations

    CRM Integrations
    From £8
    /month (+VAT)

    Number Porting

    Number Porting
    From £20
    /month (+VAT)

    Don't just take our word for how good we are

    Umar Ahmed

    We looked at several other VOIP solutions and Xinix always came out on top.

    Very easy process to get signed up! Faultless call quality, array of call features and value for money calling bundle. 

    Michael Hughes

    Second-to-none level of support - always answering the phone, and explained solutions in a no-nonsense fashion. So far the best solution we have encountered!

    Jenifer Gibson

    Operating the business from home and also being the only staff things can get challenging especially when I have to leave the office un-attended. Xinix resolved this issue with their softphone app, so now my customers can reach me on my mobile app at no further costs

    Charles Buckley

    We increased our outbound calling records by more than double through their click to dial feature. Technical issues are resolved swiftly, can’t be happier.

    Shamim Ahmed

    We were having issues with BT and integration with our online cab management system. Thanks to Xinix technical expertise these were quickly resolved. I have been with them for four years and have been recommending them since.

    Mike Coker

    We have made many changes to our PBX system, adding users, changing our dial plans and voicemails. We have always found Xinix Support to be efficient and eager to deal with all our changes.

    Kevin Dyer

    Due to our expansion we have had to move offices a few times, luckily being on cloud meant we are not restricted to the BT exchange and have always managed to take our number with us. Xinix ensured there is no downtime, I am very impressed with their project management skills.

    Nicholas Cheshire

    I was apprehensive about using a VoIP system, I called Xinix and found the gentleman amazingly refreshing! He explained everything from start to finish and help me to set up the whole system to get my business working. The tech guys are also fantastic.

    Usman Ahmed

    We operate from multiple offices, when customers were calling in, it was often a problem transferring calls between the offices. Xinix VoIP system resolved this by bringing in all the handset under one cloud solution. This made transferring calls seamless.

    Zairab Zabeer

    We have been using Xinix PBX systems for 4 years. Growing from 2 partners to now over 34. We run a multiple office operations, transferring calls between sites as well as having the one receptionist managing all our incoming calls. Our Account Managers regularly travelling from London, a rare service in this industry. Highly recommended.

    Liz Ejemole

    We really don’t understand IT or VoIP, but our Account Manager is very patient and has resolved many issues often not related to Xinix PBX. Nonetheless he has always supported us, God bless!

    Chris Clancey

    I knew very little about Xinix apart from their website, but from my calculations of looking at our current bills etc, I saw that they were definitely one of the cheapest I could find. We picked the best product for our needs and ended up saving ourselves anywhere between £70-100/month.

    Benefits of SIP Trunking and Call Management

    Cost Saving

    Cost Saving

    Thanks to multi-modal communication capability, SIP trunking enables you to save more than 30% on your monthly telecommunications costs.
    Worldwide virtual Numbers

    Trunk aggregation

    By centralising and eliminating redundant connections, you are able to use idle connections in one location for calls at another, thereby offering increased flexibility over traditional PRI circuits.
    flexibility of the service


    Depending on the needs of your organisation, the ability to add or reduce connection capacity is simple, thereby increasing the flexibility of the service you provide.
    Simplified billing

    Simplified billing

    By aggregating all the voice and data services into one product, you can take advantage of reduced administration with simplified billing.
    high video and voice quality


    By keeping communications data on pure IP connections as opposed to T1 PRI connections, SIP trunking offers improved voice and video quality, delivering almost HD-like audio.

    Answers to popular questions

    Business SIP trunking

    Business SIP trunking is a service that enables your company to operate a selection of telecommunications systems over your IP network. From cheaper international call costs to improved business flexibility, the benefits you get with Sip Trunks is endless. Incorporating a Disaster Recovery strategy to give access to an increased quantity of numbers, Business SIP trunking from Xinix can enhance the way your business stays connected.

    Our business SIP trunks represent the latest in telecommunications technology. They are a more affordable alternative to ISDN30 line rental and internet services. While retaining a level of performance that is high in flexibility, it can be tailored to your own specific needs.

    Visit our information page on — What is Onsite PBX?

    We are a vastly experienced SIP provider in UK. Our knowledgeable engineers have the expertise needed to help you with all your SIP Trunk needs, including any questions you might have in the first instance.

    Ready to Get Started?

    Reliable UK SIP Trunking

    The benefits of Xinix Switch

    • Control all your inbound calls and outbound call costs
    • Cheaper alternative to ISDN30e solutions
    • ISDN replacement – save up to 50% on line rental and up to 60% on calls.
    • Inclusive calls to 01,02, 03 and all major UK mobile networks
    • Guaranteed call quality
    • Retain your existing telephone numbers
    • Perfect for all Disaster Recovery requirements
    • Easy management via an app and web portal.

    See how it works for your business

    A sales advisor will contact you for a personalised, informative demo on the key features and benefits of a cloud phone system.