SIP Trunking

SIP Trunking

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.

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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.

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 been providing collaboration solutions for over a decade, drawing on our in-house expertise and strong relationships with industry-leading vendors.

Cisco Cloud & Managed Services Program (CMSP) Provider

As a close partner of Cisco and one of only a handful of organisations to hold Cisco Powered Hosted Collaboration Service (HCS) accreditation, you can be sure we know our Cisco products. We regularly undergo rigorous third-party audits of our operations, verifying that we have the expertise to provide reliable, secure and supported collaboration solutions.

Microsoft Certified Partner

A trusted Microsoft Partner, we hold certifications including Microsoft Azure Expert MSP, and Microsoft Tier Cloud Service Provider (CSP) Direct Partner. These enable us to deliver a true hybrid platform, with extensive capabilities across Azure public cloud, as well as services deployed in our own UK-based data centres. Services include Microsoft 365 or Office 365 licences, and our Direct Routing and Teams Call Recording solutions utilising Microsoft-certified technology. decade, and we’ve been recognised

Years Experience


Years Experience
UK-Based Staff


UK-Based Staff
SIPLink Uptime


SIPLink Uptime


Service Desk


Service Desk

Do you want to make cost-effective calls, without compromising on quality?

Modernise your telephony with our SIP Trunking solution. Simply fill in the form below and we’ll be in touch.