Best SIP Trunking Service Provider In UK - Sip Trunk XINIX

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 Trunk Pricing


No inclusive minute

£4.99+ vat
£2.99+ vat
per month / 24 months term / £35.88 paid annually
No inclusive minutes Perfect for short term projects and testing.
  • UK landline 1p/minute
  • UK mobile 3p/minute
  • Call set-up only 2p/minute
  • Call recording £0.002/minute
  • Emergency calling
  • Keep your existing phone numbers
  • Consolidate line usage across multiple sites
  • Highly scalable at short notice
  • Fully tested with leading manufacturers including: 3CX, Asterisk, Avaya, Cisco, Epygi, IPCortex, Mitel, Panasonic, Patton and more…

1000 Minutes included

£6.99 + vat
£4.99 + vat
per month / 24 months term / £59.88 paid annually
500 Minutes to UK landline and 500 minutes to UK mobile
  • 500 UK landline minutes
  • 500 UK mobile minutes
  • Call recording £0.002/minute
  • Emergency calling
  • Keep your existing phone numbers
  • Consolidate line usage across multiple sites
  • Highly scalable at short notice
  • Fully tested with leading manufacturers including: 3CX, Asterisk, Avaya, Cisco, Epygi, IPCortex, Mitel, Panasonic, Patton and more…

4000 Minutes included

£9.99 + vat
£6.99 + vat
per month / 24 months term / £83.88 paid annually
3000 Minutes to UK landline and 1000 minutes to UK mobile
  • 3000 UK landline minutes
  • 1000 UK mobile minutes
  • Call recording £0.002/minute
  • Emergency calling
  • Keep your existing phone numbers
  • Consolidate line usage across multiple sites
  • Highly scalable at short notice
  • Fully tested with leading manufacturers including: 3CX, Asterisk, Avaya, Cisco, Epygi, IPCortex, Mitel, Panasonic, Patton and more…

SIP Trunk Call Manager

SIP trunk integration with the call manager system offers a compelling solution for businesses seeking flexible, reliable, and affordable communication setups. Businesses can better adapt to the evolving dynamics of the modern business landscape by integrating SIP trunk call manager.

Here is how it works:
A call manager or unified communication manager is like a central hub that manages and controls the SIP trunking infrastructure. It manages call features, user configuration, call forwarding, call routing, and similar functionalities. For instance, a SIP trunk call manager directs incoming calls to the desired destination based on predetermined rules and configuration. This enables efficient call handling when there is a huge influx of incoming calls and also prevents call congestion. Similarly, administrators can handle user management tasks and can easily configure call features through the call manager’s user-friendly interface. SIP trunk call manager seamlessly integrates with other business tools and communication systems. This enables a unified communication experience.

Apart from the numerous benefits of SIP trunking and call manager integration, there are essential factors to consider. For instance, users need to ensure network reliability, adequate bandwidth, and compatibility as per the specifications of the SIP trunking provider.

What are SIP trunks?

Session initiation protocol (SIP) is a communication protocol of VoIP technology. This enables initiation, maintenance, modification, and termination of real-time sessions. In addition, it allows the transmission of multimedia along with voice communication. This is the technology that enables a virtual connection between an organization’s private branch exchange (PBX) and public switched telephone network (PSTN) via the internet. SIP is essentially the replacement of primary rate interfaces (PRIs) or dedicated phone lines as with the traditional phone system.

The term “SIP trunk” refers to a dedicated physical line that establishes a connection. this originates from circuit-switched telecommunications and serves a similar task as a circuit-switched predecessor. However, the key difference here is that the connection is virtual as it is established over the internet. Simply put, SIP trunks eliminate the need for dedicated phone lines. Typically used for voice communication, SIP trunks can transmit multimedia and other real-time communication services.

What is SIP trunking?

SIP trunking enables the user to connect multiple channels to the private branch exchange (PBX) system. Therefore, it enables the instant provision of global voice connectivity via VoIP communication system.

Organizations can extend VoIP infrastructure with SIP trunking and bypass the need for an IP-PSTN gateway. This is possible because of the simultaneous transmission of many signals to connect nodes in a communications system.

SIP trunking streamlines business operations. It makes use of modern PBX, eliminates VoIP gateways, and can integrate with other tools. This is how SIP trunking ensures optimal call quality and ensures streamlined business operations. SIP trunking call manager provides the user with an online admin portal making management quick and easier.

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.

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    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 one off
    /+ 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.

    Connecting Dots With the UK’s Leading SIP Trunking Provider

    Connectivity is paramount in today’s business landscape. SIP trunking, at its core, is the future of telecommunications. As a leading SIP trunk provider, Xinix is redefining the ways businesses connect, communicate, and collaborate. We believe that a reliable and cost-effective communication system is not just a luxury but a necessity for businesses to thrive.

    Fueled by innovation and guided by a profound understanding of the rapidly evolving business landscape, Xinix is here to bridge the gap. With our cutting-edge technology and state-of-the-art infrastructure, we make sure that every call and connection is clear and uninterrupted. We are bridging the gap across geographies, helping businesses thrive.

    As a SIP trunk provider, our commitment extends beyond technology. We provide unparalleled support to our customers. With years of experience, we are empowering businesses to connect globally. No matter if you are a startup or an established enterprise seeking to optimize your communication infrastructure, we are here to make it happen.

    Partner with us today and embrace the future of communication. Xinix is helping you connect the dots and stay ahead of the technology curve in today’s dynamic marketplace.

    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.