SIP Trunking
Fancy cutting spending on additional voice services? Take a SIP of this: voice and data through one connection. Get ISDN switch-off ready, with a dedicated scalable, secure voice solution for your business.
Benefits of Business SIP Trunking
Scalable channels
Fully scalable, with no long lead times, SIP Trunks are the perfect replacement for traditional ISDN lines
Fraud protection & spend controls
Limit the impact of unusual spend patterns like PBX fraud with spend management tools, and protect your business across multiple sites.
Network compatibility
Available across multiple Ethernet data circuit types.
Reporting and insights
Access detailed, per-number reporting and analytics to monitor performance and optimise usage.
Prioritised voice traffic
Automatic voice traffic prioritisation keeps every call crystal clear – even during periods of heavy demand.
Central management portal
Our optional SIP Trunk Call Manager gives full control over routing, call diverts and inbound handling, from one secure portal.
How does SIP Trunking work?
Why SIP Trunks and Why Us?
Fully scalable, with no long lead times, SIP Trunks are the perfect replacement for traditional ISDN lines – ideal for customer with on-site voice platforms.
Fraud protection and spend management
Safeguard revenue, protect your business and avoid unexpected costs with built-in fraud control and spend monitoring as standard.
Number portability
Save time and resources with phone numbers that aren't bound to your site locations.
Centralised management portal
Our optional SIP Trunk Call Manager lets you control routing, call diverts and inbound handling, all from one secure portal.
Real-time reporting and analytics
Monitor and improve business productivity and get real-time analytics with bespoke online inbound reporting.
Who is it for?
Business Type
Legacy PBX Users
Cost-efficient SIP trunking that works with your existing PBX infrastructure. Our solutions allow organisations to modernise voice systems without requiring a full system overhaul.
USE CASES
- Migrate from ISDN to SIP using existing hardware.
- Keep familiar PBX features while potentially reducing your costs.
Perfect for organisations with traditional phone systems looking to transition towards future-proof connectivity.
Business Type
Businesses with High Call Volume
Scalable, reliable SIP trunking built for organisations with heavy outbound and inbound call volumes. Our solutions have high capacity and lots of flexibility too.
USE CASES
- Manage large concurrent call loads.
- Get voice and data delivered through one connection.
Cost-effective solution for call centres, sales operations or service teams with high-volume voice traffic.
Business Type
Multi-Site Organisations
Unified SIP trunking replaces multiple phone lines at each site with one internet-based system – built for organisations with multiple sites.
USE CASES
- Centralise call handling across sites or HQ.
- Simplify billing and voice infrastructure across multiple sites.
Ideal for organisations with many offices or branches, seeking to centralise control of voice services and reduce complexity around external communications.
Our partners
We work with a trusted set of technology leaders, including Cisco, Cisco Meraki, Mitel, Zoom, Comms-care and Pangea. You get a tailored suite of best-in-class products, blended within a service wrap that adapts as your business grows.
Our customer stories
See how leading UK businesses are benefitting from our flexible services and tailored solutions.
UA92
Solutions delivered
- Leased Lines
Co-founded by the Class of '92 and Lancaster University, UA92 offers a range of degree and higher education courses whilst giving students the opportunity to work with big industry players including Microsoft, KPMG and Manchester United. UA92 needed a resilient, flexible network that could help deliver its digital-first curriculum, and power its academic and commercial ambitions.
Read story
TalkTalk Business worked closely with our team to deliver a bespoke solution that meets our current needs and set us up for success in the future. Their proactive approach made the entire process straightforward and collaborative.
Rene Lewis
Director of Digital Services, UA92
Pixel Bar
Solutions delivered
- Leased Lines
Pixel Bar is a gaming, cocktail and esports bar kitted out with arcade machines, modern consoles and high-end gaming PCs. Having opened its first site in Leeds, Pixel Bar was eager to expand its offering in Manchester with a second premise, and needed a high bandwidth, low-latency connection to facilitate the best gaming experience for patrons.
Read storyOur connectivity has given us everything we wanted. It’s enabled us to create flawless online experiences for every customer and member of staff, every time.
Craig Ryan
Co-owner, Pixel Bar
Fuller’s
Solutions delivered
- MPLS IPVPN
- 24/7 monitoring and support
- Ethernet Access Direct upgrades
- Rationalised supplier base
Fuller’s operates nearly 400 pubs and hotels. Reliable connectivity is vital. TalkTalk Business implemented a robust MPLS IPVPN to connect Fuller’s sites, supported by enterprise-grade monitoring and 24/7 support. This new network reduced costs and delivered resilience, giving Fuller’s a scalable platform to future-proof operations and support growth.
Read storyThe new solution is much more robust and stable. And TalkTalk Business is constantly monitoring the network, so I have added peace of mind.
Jared Knight
Service and IT Operations Manager, Fuller’s
Five Guys
Solutions delivered
- Leased Lines
High-end burger chain, Five Guys, needed fast, resilient business-grade internet to support its ambitious growth plans, which could support multiple business functions, at its sites and at its Head Office. With strict timelines in place, they turned to TalkTalk Business to provide a solution.
Read storyOur connectivity has given us everything we wanted. It’s enabled us to create flawless online experiences for every customer and member of staff, every time.
William Day
IT Director, Five Guys
Micheldever Tyre and Auto Services
Solutions delivered
- SIP Trunking telephony
- Cloud bolt-ons for remote working
- Ethernet over Fibre and EFM leased lines
- Meraki switch replacements
- Dual connectivity for warehouses
Micheldever sells six million tyres a year through 170 sites. Legacy ISDN systems in seven call centres created inefficiencies, while warehouse digitisation demanded reliable connectivity. TalkTalk Business implemented SIP Trunking, with cloud bolt-ons to support remote work. Additional upgrades included Ethernet circuits and Meraki switches.
Read storyCall centre staff now access the telephony system wherever they are, via a handset or softphone app. It’s making us much more responsive to customer needs.
Luke Claughton
Head of IT, Micheldever
i90
Solutions delivered
- Leased Lines
i90 is an IT consultancy, providing support and maintenance to businesses in the North East. Owner, James, used to split his time working from home and delivering on-site support to clients. But during the pandemic, James worked from home exclusively. With his family at home sharing the same internet connection, James struggled to work effectively without sacrificing his family's bandwidth needs.
Read storyWith my new leased line, I can provide services that I couldn’t even think of three months ago. I’m delighted because it’s done exactly what I needed it to do. It’s delivered the connectivity my family needed and at the same time enabled me to evolve and enhance my business offering.
James Powell
Director, i90
Society1
Solutions delivered
- Leased Lines
Society1 provides fully flexible workspaces and meeting rooms to individuals and remote teams looking for a base to work from or to take a break from working at home. Many of its customers are high-bandwidth users, so a reliable, ultrafast internet connection is vital to ensure customer retention and satisfaction. But when its previous connectivity provider went into liquidation, owner Brendan was concerned about how this would impact his business.
Read storyI’m absolutely confident in our network now. Previously, it was ok, with 50-60 people in the building at once, but we’d constantly worry if the Wi-Fi was starting to strain. Now we have the bandwidth to guarantee high speeds to hundreds of devices on the network, no matter what.
Brendon King
Owner, Society1
Matthew Clark
Solutions delivered
- CCaaS
Matthew Clark is a national beverage wholesaler, supplying alcoholic and non-alcoholic beverages, training and marketing support to thousands of hospitality premises across the UK. With a telephony system that was outdated and expensive to run, the business needed a cost-effective alternative that supported the demands of modern communication.
Read storyThe entire experience has been incredibly positive. You phone TalkTalk Business and they will get the job done. When an issue arose during installation, the TalkTalk Business team brought it up, and offered a solution at the same time that was already in progress.
Justin Nettley
Infrastructure Manager, Matthew Clark
Sausage Dog
Solutions delivered
- Leased Lines
Sausage Dog Entertainment Ltd is a franchised operation of CeX, the world’s leading technology and entertainment specialist. The business needs a robust internet connection to perform essential business tasks. But with its connectivity dropping out almost every day, staff struggled to do their job effectively. Director, Carl Brown, reached out to TalkTalk Business for a solution.
Read storyOur service hasn’t dropped off once! Now, we have a reliable connection that helps us to maintain commercial relationships and make the right first impression, every time. There’s a definite improvement in the speed and quality of the connection too.
Carl Brown
Director, Sausage Dog
Tarmac
Solutions delivered
- UCaaS
Tarmac Building Products is a division of Tarmac, the UK’s leading sustainable building materials and constructions solutions business. Seeking to streamline customer interactions, Tarmac needed a multi-channel solution to enable customers to interact with the business in the way they wanted.
Read storyWhenever I’ve needed their support, TalkTalk Business has been able to come in and show me the product and help me with my decisions. With the support of TalkTalk Business, Tarmac’s contact centre will continue to become increasingly responsive, data-driven and agile
Nikki Sampson
Commercial Excellence Manager, Tarmac
Vets Now
Solutions delivered
- UCaaS
- MPLS
Vets Now provides out-of-hours emergency care to over 1,500 veterinary practices across the UK. It already had insufficient bandwidth to support its 2,000 staff, but when the pandemic began, it needed to implement a remote working model rapidly while catering to increased demand for its online services.
Read storyTalkTalk Business was able to step up and deliver a work from home solution across our infrastructure, implementing a series of upgrades that would have usually taken 18 months to two years, and delivering them in just three months. This ensured we had additional network capacity and capabilities, which was invaluable when providing services through COVID.
Niall Phillips
Director of Technology, Vets Now
SIP Trunking FAQs
VoIP (Voice over Internet Protocol) is the technology used by many call types made over the internet, including voice and video. SIP Trunks use a subset of VoIP as they connect to customers' calling systems or Private Branch Exchanges (PBX).
The PSTN Switch Off is scheduled to happen in January 2027. Beyond this, Openreach WLR lines that include single lines and ISDN will cease to function. TalkTalk Business telephony services, which are delivered by another Openreach line called Metallic Path Facility (MPF), will be unaffected by the switch off and will continue to work. Talk to us to find out more about MPF. SIP Trunking is a direct replacement for ISDN. With SIP Trunking, you can run all your voice calls over the internet, without the need for (now outdated) ISDN lines.
Yes, SIP Trunking can work with an existing PBX system. Talk to us about how your business can migrate from ISDN to SIP. SIP Trunking brings cloud-level flexibility to your existing hardware, enabling you to retain control over internal call management. Plus, it can potentially reduce your costs and offers a scalable solution to expand your business without the drawbacks of ISDN.