SIP Trunk solutions in the United Kingdom: Future-proof, cost-effective & scalable.

Tailored SIP trunk solutions for UK businesses

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A trusted SIP trunk provider in the United Kingdom

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United Telecoms is dedicated to high-quality future-proof business telephony solutions, including VoIP landlines, SIP trunks, cloud PBX, and more.

Our SIP trunking solutions are sought after by businesses looking to upgrade their legacy PBX system to take advantage of the benefits and features of VoIP technology.

Inner London

  • Camden
  • Hackney
  • Hammersmith and Fulham
  • Haringey
  • Islington
  • Kensington and Chelsea
  • Lambeth
  • Lewisham
  • Newham
  • Southwark
  • Tower Hamlets
  • Wandsworth
  • the City of Westminster
  • the City of London

Inner London

  • Barking and Dagenham
  • Barnet
  • Bexley
  • Brent
  • Bromley
  • Croydon
  • Ealing
  • Enfield
  • Greenwich
  • Harrow
  • Havering
  • Hillingdon
  • Hounslow
  • Kingston upon Thames
  • Merton
  • Redbridge
  • Richmond upon Thames
  • Sutton
  • Waltham Forest

SIP trunks are ideal for small businesses and large multi-site corporates, offering a range of features to help you unify and streamline multi-channel communications.

To find out how we can enhance your communications with a SIP trunk solution, contact us. Get in touch via our national office number listed below or use the “chat now” button at the bottom right-hand corner of this page to find out more.

CONTACT US 033 1630 0516

What is SIP trunk?

SIP (Session Initiation Protocol) trunking is a way of providing telephone lines using data rather than fixed lines. It gives you the ability to make and receive calls using Internet Protocol (IP) technology without needing to completely replace your PBX.

SIP trunk and VoIP are similar technologies, both using IP technology to transfer voice calls, however, SIP trunking also supports voice, video, messaging and fax.

SIP trunks bridge the gap between the latest in telecommunications technology while utilising compatible legacy PBX infrastructure.

SIP trunking services offer a future-proof solution that is highly scalable, feature-rich, reliable and cost-effective. SIP trunk solutions are the ideal choice for businesses looking to upgrade their legacy telecommunications infrastructure and enhance their workflow.

Contact a friendly expert from our team to enquire about SIP trunking today.

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Benefits of SIP trunking

SIP trunks allow you modernise your business telephony infrastructure and unlock a wide range of benefits to enhance your workflow and customer experience.

By connecting your legacy PBX system to the internet, your business can take advantage of the benefits offered by VoIP solutions. This includes cost-effective call rates, feature-rich functionality, effortless scalability, integrations with existing CRMS and more.

Explore the benefits of SIP services in more detail below, and submit your enquiry today.

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SIP trunk pricing options for your business

Choosing the right SIP trunk pricing plan is crucial for cost-effective, efficient business communications.

We offer various options, such as HV.Select SIP, Wholesale SIP, and SIP2Teams, that cater to your specific needs and support your communication workflow. Our plans allow you to streamline your telecommunications setup without compromising on features or functionality.

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Requirements for SIP trunking services

Before diving into SIP trunking for your business, there are some key requirements you’ll need to meet to ensure smooth and high-quality communications.

Primarily, you’ll need compatible hardware, specifically a PBX system that supports IP-based services. Additionally, a stable and high-speed internet connection is crucial for optimal performance. Explore these essential elements in more detail and contact us to find out more about our SIP trunk solutions.

Frequently asked questions about SIP trunking & SIP trunk providers

A SIP (Session Initiation Protocol) Trunk is a virtual phone line that facilitates voice communications over the internet, converting voice data into packets that are sent over an IP network.

Our SIP Trunking services seamlessly integrate with your existing PBX system, offering a reliable and cost-effective solution for your business communication needs. Contact us today to make the switch to this modern telephony solution.

Configuration requirements can differ based on your PBX system and the specific SIP provider you go with. Well-known systems like Cisco CallManager and Asterisk have unique procedures for configuring a SIP trunk.

Our technical team at United Telecoms provides comprehensive support to guide you through the configuration process, ensuring minimal disruption to your business operations. Contact us to consult with a specialist today.

The capacity for concurrent calls depends on your available bandwidth and the limitations set by your SIP trunk provider. It’s essential to assess these factors to know how many simultaneous calls your system can manage.
We offer scalable SIP Trunking solutions that can be tailored to meet your specific call volume needs, with a transparent assessment to ensure optimal performance. Contact us to discuss your requirements.

The cost of a SIP trunk can differ depending on your chosen provider, the volume of concurrent calls you require, and any extra services or features you select.

We offer flexible pricing plans designed to fit various business sizes and budgets. Contact our team today for a customised quote that suits your business needs.

A SIP Trunk provides a virtual connection from your PBX to the internet, whereas a SIP Gateway is a physical device that serves a similar purpose but also allows connection to traditional analogue telephone lines (PSTN network).

Whether you require a SIP Trunk or SIP Gateway, United Telecoms can guide you through choosing the solution that best aligns with your business needs. Consult with us today for expert advice.

Many SIP providers offer diagnostic tools to assess the status and performance of your SIP Trunk. You can also conduct tests from within your PBX systems, like Cisco or Asterisk.

We can provide you with access to real-time monitoring tools that ensure the consistent performance and reliability of your SIP trunking services. Our support team can also help you with any queries related to the technical setup and maintenance associated with your SIP trunk solution. Contact us to find out more.

A SIP trunk channel is essentially a single route for a voice call. The number of channels you have will determine the number of concurrent calls your system can handle.

We provide SIP trunk solutions that are customisable to the number of channels you need, allowing for easy scalability as your business grows. Contact us today for a tailored SIP trunking solution today.

Got questions? Contact our experts today.


We service the following locations across London and the United Kingdom

Greater London: City of London, Hounslow, Barking and Dagenham, Islington, Barnet, Kensington and Chelsea, Bexley, Kingston upon Thames, Brent, Lambeth, Bromley, Lewisham, Camden, Merton Croydon, Newham, Ealing, Redbridge, Enfield, Richmond upon Thames, Greenwich, Southwark, Hackney, Sutton, Hammersmith and Fulham, Tower Hamlets, Haringey, Waltham Forest, Harrow, Wandsworth, Havering, Westminster and Hillingdon.

What Our Customers Say

“Once we approved the installations we were kept up to date daily with the levels of progress on our various sites and were very impressed with the final installation”

Spear Properties


Get In Touch

London Office

2 Osborne Way
KT19 8GR
United Kingdom (UK)

Tel: 033 1630 0516
Tel: 020 3399 8011


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