SIP Trunking can significantly reduce business communication costs by replacing traditional ISDN and analogue lines with a more flexible, internet-based solution. It allows businesses to scale capacity as needed, improve call routing efficiency and maintain consistently high call quality without the limitations of physical line installations.
Beyond cost and flexibility, SIP Trunking plays a key role in business continuity. Calls can be automatically redirected to alternative locations, mobile devices, or remote teams, meaning your business remains reachable even in the event of an office outage or system disruption.
At Barton Telecom Services, we have been implementing SIP Trunk solutions for over 10 years, supporting businesses through ISDN migrations, VoIP upgrades and full communications system changes. Our in-house engineers handle everything from configuration and carrier integration to fault diagnosis and optimisation, ensuring each system is built for stability, performance and long-term reliability.
Experienced
Over 30 years serving UK businesses
Reliable & Future-Proof
Built for the UK’s ISDN switch-off and beyond
Trusted Reputation
Over 100 five-star rated Google reviews
Personalised Service
No outsourced call centres, just people who genuinely care
Understanding SIP Trunking
As the traditional Public Switched Telephone Network (PSTN) and ISDN lines (traditional landlines) are being switched off by January 31st 2027, it’s important to understand the benefits of SIP Trunking. SIP is a method of communication used to send voice and data traffic over the internet. SIP is commonly used for VoIP communications. Any business with a modern IP phone system can benefit from using SIP as their communication channel. These can replace your current ISDN or analogue telephone lines prior to the big switch off.
SIP is the modern way of connecting to the outside world from your telephone system. SIP Trunks work over the internet and can offer savings on large line rental fees and call costs.
Many SIP packages offer bundled minutes which straight away lowers your monthly bills. SIP Trunks are extremely flexible as they allow you to keep your number if you were to move out of the area or for example you could have a Birmingham phone number at your Manchester site.
Our SIP Trunk Packages
We offer extremely competitive call charges and line rentals. These include bundled minute packages or if you prefer, ‘pence per minute’ packages.
Unlike most line providers, we have our own team of fully qualified engineers who can prove whether a line fault lies with BT or if it is an internal premises fault. These are the same engineers who deal with all on site work.
Be aware that all ISDN and Analogue telephone lines are being phased out by BT and will cease in 2027. Due to this, the cost of maintaining these services are increasing which also means so are the rental costs. A much better and more cost effective solution is to use SIP Trunks or a VoIP Phone System for your voice requirements.
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The Benefits of SIP Trunks
Regarded to as the future of telecommunications, SIP trunking offers your business:
- Competitive Pricing
- Call Packages
- Bundled Minutes
- Reliability and Scalability
- Protection against the ISDN / PSTN Switch Off
Experts in SIP Trunk Configuration
At Barton Telecom Services, we’ve been installing SIP Trunks and working with industry leading providers and network carriers for over 10 years. Combining this with 30+ years in all things business telecoms, we have first hand experience in all things business communications.
What areas do Barton Telecom Services cover?
Whilst being based in Earls Barton, Northamptonshire, Barton Telecom provide telecom services nationwide.
Across our 30+ years of providing telecoms support, we’ve been lucky enough to work on a variety of jobs across Northamptonshire, Buckinghamshire, Bedfordshire, Oxfordshire, and the wider Midland areas.
We also offer a nationwide service, having worked on telecom projects in the North of England, Wales and even Scotland.
No matter where you’re based in the UK, Barton Telecom is ready to deliver reliable telecom support to help your business stay connected and streamline communications.
Frequently Asked Questions
A SIP trunk is a virtual connection that facilitates the transfer of voice and other communications over the internet using the SIP protocol. Unlike traditional phone lines that use physical wires, SIP trunks operate over the internet, offering more flexibility and scalability for businesses.
Some key benefits of SIP trunks include:
Cost savings: SIP trunks often provide more cost-effective long-distance and international calling.
Scalability: Easily add or remove channels based on business needs.
Flexibility: Support for multimedia communication and various devices.
Disaster recovery: Ability to quickly reroute calls in case of emergencies.
Integration: Seamless integration with Unified Communications (UC) solutions.
Overall, SIP trunking helps businesses reduce costs while improving communication efficiency and resilience.
Additional SIP Trunks can be added at any time. We increase your capacity with no need for any onsite work completed. This means we can have additional SIP Trunks live and working for you in minutes.
SIP trunks can enable communications in a variety of media, including voice, video and data. VoIP refers only to voice communications sent over the Internet.
Yes, you can have as many telephone numbers as you need from any area of the UK. You can also add non-geographic numbers such as 03 and 0800 numbers if required.
SIP trunking is used to connect a business phone system (PBX) to the public telephone network over the internet, replacing traditional ISDN or analogue phone lines.
It enables businesses to make and receive calls more efficiently, reduce communication costs and scale their telephony system easily. It is widely used as part of modern business phone systems, especially for organisations moving towards cloud-based or hybrid working setups.
The cost of SIP trunks varies depending on the number of channels, call usage and features required. Most UK business SIP trunk services are priced on a monthly subscription basis, often starting from a low per-channel cost, with additional charges for call usage and advanced features.
The number of SIP trunks you need depends on how many simultaneous calls your business makes. As a general guide, businesses typically require one SIP trunk per concurrent call. For example, if your business handles 10 simultaneous calls, you will need around 10 SIP trunks.