Business Solutions

SIP Trunking

SIP Trunking

Make cost-effective calls, without compromising on quality, with our reliable and secure SIP trunking solution.  

Years Experience


Years Experience
UK-Based Staff


UK-Based Staff
SIPLink Uptime


SIPLink Uptime


Service Desk


Service Desk
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    Traditional phone lines are expensive 

    SIP can save you up to 55% on connection and rental costs, when compared to ISDN services.

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    You want mobility and international business

    You need telephony that delivers on quality, wherever you are and whoever you’re speaking to.

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    It’s time to modernise your telephony

    With ISDN switch-off on the horizon, now is the right time to start exploring a switch to SIP.

Lower cost calls, consistent quality

With the pressure always on to reduce costs and increase profitability, your telephony system is one area where you can make savings and still ensure excellent call quality.

Replace your traditional telephone lines with our SIP trunking solution, which providers a flexible, robust and cost-effective alternative for voice communications. Because we have total ownership, visibility and control of our SIP infrastructure, we deliver outstanding service every day, 365 days a year.

Why switch from ISDN to SIP-trunking?

ISDN will no longer be available from 2025, so if you want to future-proof your business, you’ll need to move to an IP-based system. 

SIP enables users from inside and outside of your business to make and receive telephone calls over an IP connection. Our SIP infrastructure is housed in multiple locations within our own data centres, providing a high-level of security, resilience and performance. 

Our services provide a unique range of benefits

  • Cost-effective

    Cheaper than traditional telephone line rental. Calls can be billed based on per-minute usage or through one of our inclusive minute bundles.

  • Excellent call quality

    Delivered by a SIP infrastructure that we own and control, providing you with a highly resilient, scalable service. 

  • Everything you need from one provider

    Get cloud-hosted telephony with integrated PSTN connectivity, number porting and network connectivity to our UK data centres.

  • Flexible

    Keep existing numbers, or choose between UK geographic, UK non-geographic or international numbers. 

  • Scalable

    Cater for seasonality and growth. Add new numbers without DDI rental charges.

  • Business continuity

    Multiple redundant connections to multiple locations provides re-route options in the event of disaster.  

An integrated solution for all your telephony needs

Avoid the extra cost and hassle of working with multiple providers. Work with one who can meet all your telephony solution and support needs.

Besides SIP trunking, we can provide the connectivity you need to get it up and running. If you want to replace your front-end telephone system, we provide that too. Say you’re thinking of moving your telephone system into the cloud and making more cost and space savings, we can host it in our purpose-built data centres.

Our Expertise

We’ve provided collaboration solutions for over a decade, and we’ve been recognised for delivering them with expert technical knowledge. 

We’re one of only a handful of organisations to hold the Cisco Cloud & Managed Service Provider designation, and an even more exclusive Cisco Powered Hosted Collaboration Service (HCS) accreditation.  

This means we regularly undergo rigorous third-party audits of our operations, verifying that we have the expertise to provide reliable, secure and supported collaboration solutions.  

Our services include our own SIP trunking for PSTN access, omnichannel customer contact centres, recording, and full managed services. 

Are you ready for a better, more productive business?

Communicate securely with your colleagues, customers and partners, increase business productivity and adapt to the changing demands of your workforce and customers with N4Engage.